1996 Explorer Keyless Entry Testing And Inspection

1996 Ford Truck Explorer 4WD V8-302 5.0L

Copyright © 2008, ALLDATA

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Keyless Entry: Testing and Inspection Pinpoint Tests Test Notes Door Lock Motors/Switches Inoperative The door locks are wired so that the lock and unlock switches on the doors/liftgate can operate the door locks with or without a receiver assembly installed in the system. The door lock switches are wired directly to the relays that control the door locks. When the receiver assembly operates the door locks, it provides a ground just like the door lock switches. Both the GEM and receiver assembly operate the door unlock relays. (GEM performs the two-key-turn unlock. Refer to Section 18-04A .) If the receiver assembly and GEM are both disconnected and the door locks still don't work, there is a switch, motor, lock mechanism, fuse or wiring issue. The receiver assembly uses the LOCK ALL and UNLOCK ALL Circuits 119 and 120 as outputs, but also monitors these circuits as inputs to see when the door lock switches are pressed. Pressing the UNLOCK switch on the door can unlock all doors. It unlocks the driver's door by supplying power to the driver's door lock motor through the normally closed contacts of the driver's door unlock relay. NOTE: If state is SHORT, check and service Circuits 120 (PK/LG) and 119 (PK/Y) for short to ground or each other.

A: Door Lock Motors/Switches Inoperative A: DOOR LOCK MOTORS/SWITCHES INOPERATIVE A1 CHECK MECHANICAL OPERATION OF LOCKS - Manually (not electrically) cycle the lock by turning the key in the door. Do the door lock mechanisms move freely? Yes GO to A2 No SERVICE the door lock mechanisms (LUBRICATE linkage, CLEAR interferences, etc.).ces, etc.) A2 DOOR LOCKS DON'T WORK WITH LOCK SWITCHES ON THE DOORS - Check the fuses for the door lock motors. Are the fuses OK? Yes GO to A3 No LOCATE the wiring short in the door lock power circuits. REPLACE fuse. A3 CHECK STATUS OF DOOR LOCK SWITCHES - Enter in NGS: RAP, PID/DATA and select DRLK SW to monitor the door lock and unlock switches. NOTE: Some vehicles may have power door locks, but may not have a receiver assembly system. If there is no receiver assembly, tests are limited to voltage and resistance measuring. Is NGS DRLK SW state OFF? Yes GO to A4 No If the display says UNLOCK, CHECK and SERVICE the all unlock Circuit 120 (PK/LG), door unlock switches or GEM module for a short to ground. If the display says LOCK, CHECK and SERVICE the all lock Circuit 119 (PK/Y) or door lock switches for a short to ground. If the doors lock and then unlock about once every five seconds after ignition is turned from OFF to RUN and back to OFF, CHECK the audio system. If the rear control unit (RCU) of the audio system has a connector unplugged or a loose ground, then the audio system will not work. Another side effect is that there is a floating voltage on the ignition Circuit 1002 (BK/PK) to the receiver assembly. The receiver assembly is being put into transmitter programming mode every few seconds. Fixing the audio RCU ground will fix this lock/unlock condition too. A4 CHECK OPERATION OF DOOR LOCK SWITCHES - Press LOCK button on each door lock switch and confirm that NGS, RAP DRLK SW state changes to LOCK when switches are pressed. - Press UNLOCK button on each door lock switch and confirm that NGS, RAP DRLK SW state changes to UNLOCK when switches are pressed. Does LOCK and UNLOCK state for each door lock switch occur? Yes GO to A5

1996 Ford Truck Explorer 4WD V8-302 5.0L

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No -

If UNLOCK state doesn't occur, CHECK and SERVICE the all unlock Circuit 120 (PK/LG) or door unlock switches for an open, or SERVICE the grounding circuit for the door lock switch. If LOCK state doesn't occur, CHECK and SERVICE the all lock Circuit 119 (PK/Y) or door lock switches for an open. If always UNLOCK, CHECK and SERVICE the all unlock Circuit 120 (PK/LG) or door unlock switches for a short to ground. If always LOCK, CHECK and SERVICE the all lock Circuit 119 (PK/Y) or door lock switches for a short to ground. If the doors lock and then unlock about once every five seconds after ignition is turned from OFF to RUN and back to OFF, CHECK the audio system. If the rear control unit (RCU) of the audio system has a connector unplugged or a loose ground, then the audio system will not work. Another side effect is that there is a floating voltage on the ignition Circuit 1002 (BK/PK) to the receiver assembly. The receiver assembly is being put into transmitter programming mode every few seconds. Fixing the audio RCU ground will fix this lock/unlock condition too.

A5 CHECK RECEIVER ASSEMBLY ALL LOCK OUTPUT - Enter in NGS RAP ACTIVE COMMANDS and select DR LOCK ON. Do all doors lock? Yes GO to A6 No CHECK and SERVICE Circuit 119 (PK/Y) from receiver assembly to relay. If circuit is OK, CALL phone number on receiver assembly for additional assistance. A6 CHECK RECEIVER ASSEMBLY UNLOCK DRIVER'S DOOR OUTPUT - Select NGS LF UNLOCK. Does driver's door unlock? Yes GO to A7 No CHECK and SERVICE driver's door unlock Circuit 129 (LG) from receiver assembly to relay. If circuit is OK, CALL phone number on receiver assembly for additional assistance.stance. A7 CHECK RECEIVER ASSEMBLY ALL UNLOCK OUTPUT - Select NGS DR LOCK. Do all doors unlock? Yes GO to A8 No CHECK and SERVICE Circuit 120 (PK/LG) from receiver assembly to relay. If circuit is OK, CALL phone number on receiver assembly for additional assistance. A8 CHECK DOOR LOCK SWITCH CIRCUIT - Check Circuit 119 (PK/Y) for continuity between all lock relay and door lock switch. - Check Circuit 119 (PK/Y) for continuity to ground. Is there continuity and is resistance less than 100 ohms? Yes GO to A9 No SERVICE open or ground in Circuit 119. A9 CHECK DOOR UNLOCK SWITCH CIRCUIT - Check Circuit 120 (PK/LG) for continuity between unlock relay and door lock switch. - Check Circuit 120 (PK/Y) for continuity to ground. Is there continuity and is resistance less than 100 ohms? Yes GO to A10 No SERVICE open or ground in Circuit 120. A10 CHECK DOOR UNLOCK POWER CIRCUITS - Disconnect receiver assembly and GEM module. - Remove all doors lock relay, all doors unlock relay and driver's door unlock relay. - Jumper battery voltage to the common contact (Pin 3) of all doors unlock relay connector and jumper ground (Pin 4) to common contact (Pin 3) of all doors lock relay connector. Do door lock motors unlock? Yes GO to A11

1996 Ford Truck Explorer 4WD V8-302 5.0L

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No SERVICE all circuits connecting to door lock relays for shorts or opens. REPLACE door lock relays only if required following wiring repairs. DISCONNECT door lock motors and power separately to confirm operation. A11 CHECK DOOR LOCK POWER CIRCUITS - Confirm receiver assembly and GEM module as well as the all doors lock relay, all doors unlock relay and driver's door unlock relay are disconnected. - Jumper battery voltage to common contact (Pin 3) of all doors lock relay connector and jumper ground (Pin 4) to common contact (Pin 3) of the all doors unlock relay connector. Do door lock motors lock? Yes CHECK and REPLACE relays by placing known good relays in place of door lock and unlock relays. No Repair circuits 117(PK/BK) and/or 118 (PK/O) for shorts or opens. REPLACE door lock relays only if required following wiring repairs. If substitute relays do not correct condition, GO to A7

B: Transmitter/Remote Entry Inoperative B: TRANSMITTER/REMOTE ENTRY INOPERATIVE

Remote Entry range may be affected when operated within a quarter mile of some radio or TV towers. Although the range is reduced at these locations, the owner should still be able to enter their vehicle using the remote transmitter. A special transmitter TIC/DATA menu is available on NGS Testers November 1994 and later. A receiver assembly on vehicles made before February 1995 will respond to this menu but will have diagnostic communication ending only a few seconds after entering the menu.

B1 CHECK TRANSMITTER/REMOTE ENTRY OPERATION - Turn ignition OFF. - Perform the self test as described in Remote Control Alarm and Lock System, Pinpoint Test A to insure that the receiver assembly has power. See: Testing and Inspection/Remote Control Alarm and Lock System - Press each button on remote entry transmitter fob while standing 10 meters/yards away from vehicle and confirm that operation is as described in Description and Operation, Transmitter, Remote Entry . Was there an appropriate response for each button press? button press? yes System OK No GO to B2 if there was no response to the transmitter. GO to the correct pinpoint test for the specific output which did not function correctly, if there was only a partial response. Some outputs are covered in Antitheft and Alarm Systems. See: Testing and Inspection

B2 CHECK FOR ANY RESPONSE FROM TRANSMITTER NO. 1 Does system respond to any button press from transmitter in question when standing closer or inside of vehicle? Yes GO to B4 No GO to B3

B3 CHECK FOR ANY RESPONSE FROM TRANSMITTER NO. 2 Does the system respond to any button press from the other transmitter when standing closer or inside of the vehicle? Yes GO to B6 No GO to B4

B4 ANTENNA CHECK - Confirm that while testing for 10 meters/yards range of remote entry system that the vehicle is more than .8 km (1/2 mile) away from radio or TV towers. If closer than .8 km (1/2 mile) away from a TV or radio tower, a 5 meter/yard range is acceptable. - Check to see if the antenna connecting to the receiver assembly module is fully seated or is missing. - Connect antenna or press it fully into receiver assembly. - Test range with transmitter. Has range improved? Yes REPEAT B1 No GO to B5

1996 Ford Truck Explorer 4WD V8-302 5.0L

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B5 ANTENNA DAMAGE CHECK - Disconnect antenna from RAP module. - Check for less than 10 ohms of resistance from antenna signal pin to opposite end of antenna coax center conductor. - Reconnect antenna to receiver assembly. Is resistance less than 10 ohms? Yes Antenna is OK. GO to B6 No REPLACE the antenna and REPEAT B B6 NGS TRANSMITTER TIC/DATA STORED TICS - Enter in NGS: RAP, FUNCTION TESTS, TRANSMITTER TIC/DATA in order to see which Transmitter Identification Codes (TICs) are stored in the RAP module. - When TRANSMITTER TIC/DATA screen first comes up, different eight digit letter/number codes should appear next to the TIC 1: and TIC 2: symbols on right. TIC 1 is stored TIC for Transmitter 1, and TIC 2 is stored TIC for Transmitter 2. NOTE: Since receiver assembly can store up to 4 transmitter codes, there may be a third and fourth TIC programmed to system next to TIC 3 and TIC 4. These were extra transmitters programmed after vehicle was delivered. Are there at least two transmitters stored and displayed next to TIC 1 and TIC 2? Yes GO to B7 No TURN ignition OFF, PROGRAM all of the transmitters to be used with this system (at least two) as described in Service and Repair, Programming - Transmitter See: Service and Repair B7 NGS TRANSMITTER TIC/DATA LAST TIC RECEIVED - Press NGS trigger button, and turn ignition OFF, in order to see that system is receiving TIC and DATA (which button is pressed) for specific transmitter being pressed. - Press and release UNLOCK button many times for transmitter in question as soon as ignition is turned OFF. A transmission should be received 3-4 seconds after turning ignition OFF. (This time is needed for receiver to stabilize.) Transmission received contains TIC for transmitter being operated and DATA for which button has been pressed. - Vehicles built before February 1995 may lose their string of diagnostic communication a few seconds after ignition is turned OFF or about 30 seconds after a received transmission if system is inactive. This is normal operation and it may be difficult to capture transmissions through diagnostics. If vehicle has a keypad on door, pressing a button on keypad before turning ignition OFF will help continue diagnostic communication. If string of communications ends with ignition OFF, turn ignition ON to reenter TRANSMITTER TIC/DATA menu, and then restart Step B6 NOTE: Pressing CLEAR will clear last transmission received, but will not clear stored TICs in memory. NOTE: It is normal for LAST TIC RECEIVED and LAST DATA RECEIVED to flash different information momentarily when button is pressed. Information will lock in on correct values. Tester is catching computer updating its memory. Does an eight digit letter/number code appear under LAST TIC RECEIVED: and word UNLOCK appear under LAST DATA RECEIVED:? Yes GO to B10. Transmitter and Reciever Assembly are OK. No GO to B8 B8 NGS TRANSMITTER TIC/DATA OTHER TRANSMITTER - Repeat Steps B6 and B7 , but press and release UNLOCK button many times for other transmitter as soon as ignition is turned OFF. A transmission should be received 3-4 seconds after turning ignition OFF. (This time is needed for receiver to stabilize.) Does an eight digit letter/number code appear under LAST TIC RECEIVED: and word UNLOCK appear under LAST DATA RECEIVED:? Yes GO to B9 No GO to B12 B9 TEST TRANSMITTER BATTERIES - Switch batteries in good transmitter tested in Step B8 with poor transmitter tested in Step B7 . (See Removal and Installation, Transmitter Battery .) - Press and release the UNLOCK button many times for transmitter tested in B7. A transmission should be received 3-4 seconds after turning ignition OFF. (This time is needed for the receiver to stabilize.) Does an eight-digit letter/number code appear under LAST TIC RECEIVED: and word UNLOCK appear under LAST DATA RECEIVED:? Yes RETURN original batteries to both transmitters, REPLACE batteries in transmitter tested in B7, and repeat B1.

1996 Ford Truck Explorer 4WD V8-302 5.0L

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No CALL for assistance to phone number listed on receiver assembly, before replacing the transmitter tested in B7. B10 NGS TRANSMITTER TIC/DATA TIC MATCH Does TIC under LAST TIC RECEIVED: match TIC 1 or TIC 2 (TIC 3 or TIC 4)? Yes GO to B11 No TURN ignition OFF. PROGRAM all transmitters to be used with this system (at least two) as described in Service and Repair, Programming Transmitters See: Service and Repairand REPEAT B1. B11 NGS TRANSMITTER TIC/DATA TIC MATCH Do all buttons pressed for each transmitter create expected LAST DATA RECEIVED output? Yes System should be operating OK. CALL for assistance to phone number listed on receiver assembly. No TURN ignition OFF. PROGRAM all transmitters to be used with this system (at least two) as described in Service and Repair, Programming Transmitters See: Service and Repairand REPEAT B1, or CALL for assistance to phone number listed on receiver assembly before replacing the transmitter in question. B12 CHECK RECEIVER ASSEMBLY FOR EXPORT REMOTE SHORTING BAR - Enter in NGS RAP PID/DATA and select NOREMOT. Does NOREMOT PID display OFF? Yes CALL phone number on receiver assembly for additional assistance. No INSPECT wiring connector for no remote shorting Pin C1-22. If present, REMOVE and GO to B1 . If not present, CALL phone number on receiver assembly for additional assistance.

C: Illuminated Entry Request Inoperative C: ILLUMINATED ENTRY REQUEST INOPERATIVE The GEM module ( Section 18-04A ) controls the interior lights with the illuminated entry function. The receiver assembly sends pulses on the GEM illuminated entry circuit to request the illuminated entry begin or end. Circuit 1013 (BR/LG) is normally pulled up by the GEM module. The receiver assembly pulls the voltage low with pulses of different lengths. - 200 mS pulse from receiver assembly requests illuminated entry on. - 300 mS pulse from receiver assembly requests illuminated entry off. Two quick presses on the keyless entry keypad may cause the GEM illuminated entry to shut off. Pressing the keypad button at different rates may cause the interior lights to flicker. This condition can be corrected by replacing the GEM. After February 1995, call the phone number on the GEM or receiver assembly for additional information. C1 CHECK ILLUMINATED ENTRY OPERATION - Press the UNLOCK button on a remote transmitter for any keypad button) to unlock the doors and turn the illuminated entry on. - Press the LOCK button on a remote transmitter (or lock with keypad) within 20 seconds of pressing the UNLOCK button to lock the doors and turn the illuminated entry off. Does illuminated entry work as described? Yes Illuminated entry request function appears OK. CLARIFY with customer and REVIEW customer symptoms table. No If illuminated entry did not work as described, GO to C2 . If driver's door either did not lock or did not unlock, REPEAT C1 to make sure transmitter was pressed and GO to Pinpoint Test B. C2 MEASURE GEM ILLUMINATED ENTRY VOLTAGES - Measure the voltage on Circuit 1013 (BR/LG) at the receiver assembly (keep modules connected) using signal ground Circuit 570 (BK/W) as a voltage reference. Measure voltage with NGS, DIGITAL MEASUREMENT, VOLTMETER, setting RANGE at 40V. - Continue to measure voltage and press the UNLOCK button on the transmitter (or any keypad button). Was the MIN voltage captured when the pulse was transmitted less than 1.3V? Yes GO to C3 . No CLEAR MIN voltage and REPEAT Test C2 once to CONFIRM high voltage; if so, CALL phone number on receiver assembly for additional assistance.

C3 MEASURE GEM ILLUMINATED ENTRY PULSE WIDTH. - Keep setup from C2.

1996 Ford Truck Explorer 4WD V8-302 5.0L

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- Select NGS, DIGITAL MEASUREMENT, PULSE WIDTH METER, and choose LEVEL setting LOW. - Press the UNLOCK button on the transmitter (or any keypad button). Was the PULSE WIDTH between 190 and 210 mS? Yes GO to C4 No CALL phone number on receiver assembly for additional assistance. C4 CHECK GEM ILLUMINATED ENTRY REQUEST CIRCUIT - Check Circuit 1013 (BR/LG) for shorts or an open between the RAP and GEM modules. Is the wiring OK? Yes GO to GEM Module See: General Moduleto diagnose the GEM module for illuminated entry operation. No SERVICE Circuit 1013 (BR/LG).

D: Remote Memory Seats Inoperative D: REMOTE MEMORY SEATS INOPERATIVE If a third transmitter is programmed to the receiver, the remote memory seats will move the seat to a third lesser known position which is set/used by pressing the door memory seat switches 1 and 2 at the same time. If a fourth transmitter is programmed to the receiver, it will not operate the memory seats. D1 ATTEMPT NORMAL REMOTE MEMORY SEAT 1 OPERATION - Check normal memory seat operation with manual switches on doors. - Place seat in third memory location (use Memory 1 and 2 door switches). - Press UNLOCK on Transmitter 1 See: Service and Repair Does driver's seat move to position corresponding to pressing memory seat button 1 on driver's door when doors are unlocked with Transmitter 1 (molded in back of transmitter key fob)? Yes. GO to D2 No GO to D3 . If no seat movement and driver's door did not unlock, REPROGRAM both transmitters to receiver assembly system See: Service and Repair and REPEAT this test step. If driver's door unlocks, but seats do not move, GO to D3 D2 ATTEMPT NORMAL REMOTE MEMORY SEAT 2 OPERATION - Place seat in third memory location (use Memory 1 and 2 door switches). - Press UNLOCK on Transmitter 2 as described in Description and Operation, Memory Seat, Remote . Does driver's seat move to position corresponding to pressing memory seat button 2 on driver's door when doors are unlocked with Transmitter 2 (molded in back of transmitter key fob? Yes Remote memory seat functions appear OK. CLARIFY with owner and REVIEW customer symptoms table. No If the driver's door did not unlock, REPROGRAM both transmitters to receiver assembly system. If the driver's door did unlock, GO to D1 , or GO to D4. D3 CONFIRM REMOTE MEMORY SEATS ARE ENABLED - Perform enable/disable sequence for remote memory seats feature as described in Description and Operation, Enabling and Disabling features. First time this sequence is performed does horn chirp twice followed by longer honk? Yes GO to D1 (you just enabled a feature which was previously disabled by the vehicle user). No If one horn chirp sounded but no longer horn honk, ENABLE remote memory seats feature again with same sequence but with longer honk this time (the remote memory seats feature was enabled originally and it was disabled). GO to D4 after enabling. If can't make enable sequence respond, CONFIRM all doors, liftgate and liftgate window were closed and that theft system was disarmed for enable mode entry, or VERIFY door ajar, door lock/unlock switch and ignition inputs to receiver assembly with NGS Tester. D4 CHECK RAP MEMORY SEAT 1 OUTPUT - Enter in NGS: RAP, ACTIVE COMMANDS, SEAT MEMORY and turn MEMORY 1 ON, with MEMORY 2 remaining OFF. Does driver's seat move to memory 1 position? Yes GO to Pinpoint Test B to confirm that Transmitter 1 is stored in receiver assembly as Transmitter 1 (TIC1). No

1996 Ford Truck Explorer 4WD V8-302 5.0L

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GO to D5 D5 MEMORY SEAT 1 JUMPERED OPERATION - Disconnect the receiver assembly. - Momentarily short Memory 1 Circuit 267 (BR/LG) to Signal Ground (570 BK/W). Did seat move to memory 1 position? Yes GO to D6 No SERVICE Memory 1 Circuit 267 (B/LG) from receiver assembly to door memory switches for opens or shorts to ground. D6 CHECK RAP MEMORY SEAT 2 OUTPUT - Enter in NGS: RAP, ACTIVE COMMANDS, SEAT MEMORY and Turn MEMORY 2 ON, with MEMORY 1 remaining OFF. Does driver's seat move to the memory 2 position? Yes GO to Pinpoint Test B to confirm that Transmitter 2 is stored in receiver assembly as Transmitter 2 (TIC2). GO to D7. No GO to D7 D7 MEMORY SEAT 2 JUMPERED OPERATION - Disconnect the receiver assembly. - Momentarily short Memory 2 Circuit 268 (BK/O) to Signal Ground (570 BK/W). Did seat move to memory 2 position? Yes CALL phone number on receiver assembly for additional assistance. No SERVICE Memory Seat 2 Circuit 268 (BK/O) from receiver assembly to the door memory switches for opens or shorts to ground.

E: Confirm Normal Keypad Operation E: KEYPAD ENTRY INOPERATIVE E1 CONFIRM NORMAL KEYPAD OPERATION - Unlock driver's door with keypad code (Explorer only) See: Service and Repair. - Confirm that keypad lights and that interior lights come on with first button press. - Press 3/4 button within five seconds of unlocking doors with keypad code. - Press 7/8 and 9/10 button to lock all doors, turn off keypad lamp and turn off interior lights. Do all functions occur as expected? Yes Keypad functions appear OK. CLARIFY with owner and REVIEW owner symptoms table. No If the keypad code did not work (or has been lost), GO to E2. If the doors do unlock, but the keypad doesn't light with any button press, GO to E4. If interior lights do not illuminate, but keypad does light when keypad buttons are pressed, GO to Pinpoint Test C. If it appears that a certain keypad button is not working, GO to E3. E2 CHECK KEYPAD CODE - Enter in NGS: receiver assembly, PID/DATA. Select KEYCODE. Does KEYCODE match keycode that owner has been trying to use as factory code (factory code should be printed on wallet code card originally inserted in owner manual packet)? Yes GO to E3 No EREPEAT E1 to confirm operation, and INFORM owner of correct keycode. 3 CHECK EACH KEYPAD BUTTON - Enter in NGS: RAP, PID/DATA. Select KEY PAD. - Confirm that numbers do not display when keypad buttons are not pressed. - Press each five keypad buttons separately. (Note that keypad number 1 and 2 are associated with same button and switch but appear on the display as 1 , the 3/4 appear as -3, and so on.) - Confirm that display shows only keypad switch being pressed. Do all keypad buttons change state independent of each other? Yes CALL phone number on receiver assembly for additional assistance. No If a keypad number remains displayed when no buttons are pressed, CHECK the keypad for a button short, or SERVICE the keypad button circuit for a short to ground. If a keypad number does not display when it is pressed, CHECK the keypad for a button open, or SERVICE the

1996 Ford Truck Explorer 4WD V8-302 5.0L

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keypad button or keypad common circuit for an open. If more than one keypad number shows on display when only one button is pressed, CHECK the keypad for a short between buttons, or SERVICE the keypad button circuits forircuits for a short. E4 CHECK KEYPAD LAMP - Enter in NGS: RAP, ACTIVE COMMANDS, select KEYPAD BACK LIGHTING and turn it ON. Does keypad lamp turn on? Yes GO to E3 No GO to E5 E5 MANUAL KEYPAD LAMP ACTIVATION - Disconnect receiver assembly. - Momentarily short Keypad Illumination Circuit 66 (LB) to Battery Circuit 645 (W/LB). Does keypad lamp turn on? Yes CALL phone number on receiver assembly for additional assistance. No GO to E6 E6 CHECK KEYPAD LAMP AND KEYPAD LAMP WIRING - Disconnect keypad pigtail from harness. - Momentarily short Keypad Illumination Circuit 66 (LB) to Battery and Ground Circuit 57 (BK) to Ground on keypad pigtail connected to keypad. Does keypad lamp turn on? Yes SERVICE harness Keypad Illumination Circuit 66 (LG) or Ground for Keypad Illuminationination circuit 57 (BK) No REPLACE keyless entry keypad due to probable internal short.

F: Autolock Inoperative F: AUTOLOCK INOPERATIVE F1 ATTEMPT NORMAL AUTOLOCK/RELOCK OPERATION NOTE: Read Autolock Description and Operation to understand the conditions required for autolock to function. - Perform autolock and relock sequences described in Description and Operation, Autolock . Do autolock and relock features work? Yes Autolock/relock functions appear OK. CLARIFY with owner and REVIEW owner symptoms No GO to F2 F2 CONFIRM AUTOLOCK IS ENABLED - Perform Enable/Disable sequence for autolock/relock feature as described in Description and Operation. First time this sequence is performed does horn chirp once followed by longer honk? Yes GO to F1 (you just enabled a feature which was previously disabled by the vehicle user). No If one horn chirp sounded, but no longer horn honk followed, ENABLE autolock feature again with same sequence but with longer honk this time (Autolock feature was enabled originally, and was disabled in F2 ). GO to F3 after enabling Autolock. If can't make enable sequence respond, CONFIRM all doors, liftgate and liftgate window were closed and that theft system was disarmed for enable mode entry, or VERIFY horn output and door ajar, door lock/unlock switch, and ignition inputs to receiver assembly with NGS tester. F3 CHECK BRAKE ON/OFF INPUT - Enter in NGS: RAP, PID/DATA and select BOO RAP to monitor Brake On/Off Switch. - NGS BOO RAP state is OFF. - Press brake pedal. - NGS BOO RAP state is ON. Do both states appear on NGS? Yes GO to F4 No If always ON, CHECK and if necessary, REPLACE hi-mount brake bulb, or SERVICE Circuit 511 (R/LG) for an open or shorted circuit. If

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always OFF, SERVICE Brake On/Off switch, or SERVICE Circuit 511 (R/LG). F4 CHECK DOOR AJAR INPUT - Enter in NGS: RAP, PID/DATA and select DOORRAP to monitor GEM Door Ajar to see Door Ajar State. - Close all doors, liftgate and liftgate glass. - NGS DOORRAP state is CLOSED. - Open any door. - NGS DOORRAP state is AJAR. Do both states appear on NGS? Yes GO to F5 No If always AJAR, SERVICE door/liftgate/liftgate window ajar input circuits/switches with GEM module diagnostics See: General Moduleor SERVICE Circuit 999 (R/BK) for a short to ground with ignition in RUN. If always CLOSED, SERVICE Circuit 999 (R/BK) for an open or SERVICE door/liftgate/liftgate window ajar input circuits/switches with GEM module diagnostics. F5 CHECK IGNITION INPUT - Enter in NGS: RAP, PID/DATA and select IGN RAP to monitor ignition state. - Turn key to OFF position. NGS communication may be lost after a few seconds. - NGS IGN RAP is OFF. - Return ignition key to RUN position and resume NGS PID/DATA communication if necessary. - NGS IGN RAP state is RUN/AC. Do both states appear on NGS? Yes CALL phone number on receiver assembly for additional assistance. No If always RUN/AC state, SERVICE ignition switch or SERVICE Circuit 1002 (B/PK) for a 100 ohm or less battery short. If always OFF state, SERVICE Circuit 1002 (B/PK) for an open, blown fuse, or short to ground or SERVICE ignition switch.