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Seats: Testing and Inspection Power Seats With Memory PRINCIPLES OF OPERATION - POWER SEATS WITH MEMORY Seat Positioning - Seat Control Switch NOTE: Two memory seat modules are used, one for vehicles built up to 03/2002 and one for vehicles built 03/2002 onward. The modules are not interchangeable. The six-way power seat is controlled by the driver seat module (DSM) only when the vehicle is equipped with the memory driver seat option. The DSM will power the forward/rearward or up/down motion of the motor until the corresponding seat control switch is released or until end of travel is reached. Seat Positioning - Memory Feature The memory driver seat feature allows the driver to program a personalized seat position that can be recalled using the memory switches or remote entry key fob. There are three memory settings possible. The adjustable pedal positions are also stored and recalled with the driver memory seat positions. A power driver seat position can be stored at any time. To store the power driver seat positions to memory, the driver must move the seat to the preferred positions using the driver seat control switch assembly. The driver must then depress the memory set switch. In response to this, the DSM will activate the memory set switch LED and initialize a 5.0 ± 1.0 second timer. The driver then has 5.0 ± 1.0 seconds to select a memory position. - Memory 1 is selected by depressing and holding the memory switch 1 for 100.0 milliseconds. - Memory 2 is selected by depressing and holding the memory switch 2 for 100.0 milliseconds. - Memory number 3 is selected by depressing both memory switches 1 and 2 within 75.0 milliseconds of each other and holding them for an additional 50.0 milliseconds. If no memory switch input is received within the 5.0 ± 1.0 second time limit, the operation is aborted and the memory set switch LED is turned off. one of the following inputs is received during the 5.0 second programming window, the operation is aborted and the memory set switch LED is turned off: - Power driver seat control switch - Adjustable pedal switch - Memory set switch Upon detection of a completed memory set process, the DSM will save power driver seat positions, and adjustable pedal positions in the appropriate memory (1, 2, or 3). The DSM derives seat position information (front height, rear height, forward/rearward) from the driver seat position sensors. NOTE: A Memory Recall can only be initiated if the vehicle is in PARK or NEUTRAL gear, and the ignition switch is not in START. An ongoing memory recall will not be affected by moving the ignition switch to START nor by moving the gearshift lever out of PARK or NEUTRAL. Once the driver has stored a preferred driver seat position, the driver can recall the setting by depressing the corresponding memory switch or using a programmed RKE key fob. The driver can recall a preferred driver seat position by one or both of the memory recall switches. - Pressing and holding memory switch 1 for 100.0 milliseconds will initiate a recall of the power driver seat position stored in memory number 1. - Pressing and holding memory switch 2 for 100.0 milliseconds will initiate a recall of the power driver seat position stored in memory number 2. - Pressing and holding memory switches 1 and 2 within 75.0 milliseconds of each other and holding them for an additional 50.0 milliseconds will initiate a recall of the power driver seat position stored in memory number 3. An RKE key fob (security module interface) can be used to recall previously set memory positions. The key fob assigned with personality No. 1 is capable of only recalling memory position 1. The personality No. 2 key fob can only recall memory position 2. Memory recall occurs when the UNLOCK switch is pressed on the key fob. The second depression of the UNLOCK switch, which unlocks passenger doors, does not initiate a memory recall. An ongoing memory recall does not prohibit the initiation of another memory recall; the most recently requested memory recall will be executed. If the driver seat control switch is activated during a memory recall, the memory recall seat movement will stop and, the switch commands will be executed. Activation of the memory set switch or adjustable pedal switch will also cancel a memory recall in progress. Memory positions that have not been programmed will not initiate any motion for the power driver seat, and adjustable pedals.
Power Seat Calibration Test The driver seat module (DSM) is calibrated using the scan tool. The calibration procedure automatically powers the driver power seat through its full range of motion and records the full stop positions by monitoring the motor position sensors. Once the full stop positions or range of the seat have been recorded, the DSM will only operate within the calibrated range. Any input attempting to drive the seat beyond the calibrated range will be
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ignored. This calibration is used for all seat control functions including manual switch control and memory recall positioning. During the seat calibration, the DSM may identify a function that is inoperative, such as a position sensor not changing. If the DSM identifies a concern that has a related diagnostic trouble code (DTC), the DSM will set the related DTC at the end of the validation procedure. The calibration procedure powers the seat track adjustments to the end of their travel, which is determined by the DSM seeing a change of state in the motor position sensors. If there is a concern with the seat track or motor position sensor that limits the travel, the DSM will interpret the stopping point as the end of travel and store the position. The DSM is not able to determine if the seat has moved to its full travel position. It is only capable of monitoring and storing the amount of travel seen by the position sensor changing states.
Power Seats Without Memory PRINCIPLES OF OPERATION - POWER SEATS WITHOUT MEMORY The six-way power seat feature moves the seat in six possible directions: the base of the seat can be moved forward or backward and the front and back of the base cushion can be moved up and down independently. The power seat feature operates independent of the position of the ignition. The power seat motors are hardwired to the seat control switch. The circuits are normally at ground through the seat control switch. The individual circuit is switched to power when the specific adjustment position is selected.
Vehicles Built Up to 03/2002 PRINCIPLES OF OPERATION - HEATED SEATS - VEHICLES BUILT UP TO 03/2002 NOTE: Two heated seat modules are used, one for vehicles built up to 03/2002 and one for vehicles built 03/2002 onward. The modules are not interchangeable.
The driver and passenger heated seats share a common battery and ignition feed. A separate shared ignition source supplies the heated seat control switches. When the heated seat control switch is pressed with the ignition switch in RUN or START, a momentary voltage signal is sent to the heated seat module. The heated seat module then supplies power to the heating element circuit. The cushion element and seat backrest element are wired in series and powered by the same output. The heated seat module will supply voltage to a separate indicator circuit to the dual automatic temperature control (DATC) module display panel to indicate an ON state. The heated seat module will remain on until the heated seat control switch is pressed and a momentary voltage signal is received, or until 10 minutes expire. If the ignition source is removed from the module, the heated seat module will enter an OFF state and will not return to ON until the switch is once again pressed with the ignition switch in RUN. The heated seat module is designed to heat the seat to 37.5°C (99.5°F) and maintain the temperature until time-out or switched off. This temperature is maintained by the heated seat module monitoring the temperature sensor located in the seat cushion element, and adjusting the current flow to the heating elements.
Vehicles Built 03/2002 Onward PRINCIPLES OF OPERATION - HEATED SEATS - VEHICLES BUILT 03/2002 ONWARD NOTE: Two heated seat modules are used, one for vehicles built up to 03/2002 and one for vehicles built 03/2002 onward. The modules are not interchangeable.
The driver and passenger heated seats share a common battery and ignition feed. A shared ground source supplies the heated seat control switches. When the heated seat control switch is pressed with the ignition switch in RUN or START, a momentary ground signal is sent to the heated seat module. The heated seat module then supplies power to the heating element circuit. The cushion element and seat backrest element are wired in series and powered by the same output. The heated seat module will supply voltage to a separate indicator circuit to the dual automatic temperature control (DATC) module display panel to indicate an ON state. The heated seat module will remain on until the heated seat control switch is pressed and a momentary voltage signal is received, or until 10 minutes expire. If the ignition source is removed from the module, the heated seat module will enter an OFF state and will not return to ON until the switch is once again pressed with the ignition switch in RUN. The heated seat module is designed to heat the seat to 37.5°C (99.5°F) and maintain the temperature until time-out or switched off. This temperature is maintained by the heated seat module monitoring the temperature sensor located in the seat cushion element, and adjusting the current flow to the heating elements.
Inspection and Verification INSPECTION AND VERIFICATION 1. Verify the customer concern.
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Visual Inspection Chart 2. Visually inspect for obvious signs of mechanical and electrical damage. 3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step. 4. If the cause is not visually evident, connect the diagnostic tool to the data link connector (DLC) and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle: - Check that the program card is correctly installed. - Check the connections to the vehicle. - Check the ignition switch position. 5. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual. 6. Carry out the DATA LINK DIAGNOSTIC TEST. If the diagnostic tool responds with: - CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to Information Bus (Module Communications Network). - NO RESP/NOT EQUIP for driver seat module (DSM), Information Bus (Module Communications Network). - SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out self test diagnostics for the DSM. 7. If the DTCs retrieved are related to the concern, go to DSM Diagnostic Trouble Code (DTC) Index. See: Trouble Code Diagnostic Charts 8. If no DTCs related to the concern are retrieved, GO to Symptom Chart. See: Diagnosis By Symptom
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Test A: The Power Seat Is Inoperative PINPOINT TEST A: THE POWER SEAT IS INOPERATIVE
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Test B: The Power Seat Does Not Move Horizontally/Vertically - Vehicles Built Up to 03/2002 PINPOINT TEST B: THE POWER SEAT DOES NOT MOVE HORIZONTALLY/VERTICALLY - VEHICLES BUILT UP TO 03/2002
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B19-B20
Test C: The Power Seat Does Not Move Horizontally/Vertically - Vehicles Built 03/2002 Onward PINPOINT TEST C: THE POWER SEAT DOES NOT MOVE HORIZONTALLY/VERTICALLY - VEHICLES BUILT 03/2002 ONWARD
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C20
Test D: The Memory Seat Is Inoperative - Vehicles Built Up to 03/2002 PINPOINT TEST D: THE MEMORY SEAT IS INOPERATIVE - VEHICLES BUILT UP TO 03/2002
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D30
Test E: The Memory Seat Is Inoperative - Vehicles Built 03/2002 Onward PINPOINT TEST E: THE MEMORY SEAT IS INOPERATIVE - VEHICLES BUILT 03/2002 ONWARD
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E26
Test F: The Memory Seat Does Not Operate Correctly - Does Not Operate Using the Memory Set Switch - Vehicles Built Up to 03/200 PINPOINT TEST F: THE MEMORY SEAT DOES NOT OPERATE CORRECTLY - DOES NOT OPERATE USING THE MEMORY SET SWITCH - VEHICLES BUILT UP TO 03/2002
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F18
Test G: The Memory Seat Does Not Operate Correctly - Does Not Operate Using the Memory Set Switch - Vehicles Built 03/2002 Onwa PINPOINT TEST G: THE MEMORY SEAT DOES NOT OPERATE CORRECTLY - DOES NOT OPERATE USING THE MEMORY SET SWITCH - VEHICLES BUILT 03/2002 ONWARD
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Test H: The Memory Seat Does Not Operate Correctly - Does Not Operate Using the Remote Transmitter - Vehicles Built Up to 03/20 PINPOINT TEST H: THE MEMORY SEAT DOES NOT OPERATE CORRECTLY - DOES NOT OPERATE USING THE REMOTE TRANSMITTER - VEHICLES BUILT UP TO 03/2002
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H2
Test I: The Heated Seat Is Inoperative - Vehicles Built Up to 03/2002 PINPOINT TEST I: THE HEATED SEAT IS INOPERATIVE - VEHICLES BUILT UP TO 03/2002
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I3
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I5
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I10
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I11
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I17
Test J: The Heated Seat Is Inoperative - Vehicles Built 03/2002 Onward PINPOINT TEST J: THE HEATED SEAT IS INOPERATIVE - VEHICLES BUILT 03/2002 ONWARD
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J1
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J3
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J4
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J6
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J7
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J8
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J9
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J10
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J11
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J12
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J13
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J14
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J15
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J16
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J17
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J18
Test K: The Heated Seat Is Inoperative - Seat Does Not Heat But the Heated Seat Indicator Illuminates When Pressed - Vehicles B PINPOINT TEST K: THE HEATED SEAT IS INOPERATIVE - SEAT DOES NOT HEAT BUT THE HEATED SEAT INDICATOR ILLUMINATES WHEN PRESSED - VEHICLES BUILT UP TO 03/2002
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K1
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K6
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K7
Test L: The Heated Seat Is Inoperative - Seat Does Heat But the Heated Seat Indicator Does Not Illuminate When Pressed - Vehicl PINPOINT TEST L: THE HEATED SEAT IS INOPERATIVE - SEAT DOES HEAT BUT THE HEATED SEAT INDICATOR DOES NOT ILLUMINATE WHEN PRESSED - VEHICLES BUILT UP TO 03/2002
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L1
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L3 Continued
Test M: The Heated Seat Is Inoperative - Seat Does Heat But the Heated Seat Indicator Does Not Illuminate When Pressed - Vehicl PINPOINT TEST M: THE HEATED SEAT IS INOPERATIVE - SEAT DOES HEAT BUT THE HEATED SEAT INDICATOR DOES NOT ILLUMINATE WHEN PRESSED - VEHICLES BUILT 03/2002 ONWARD
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M1
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M2
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M3 Continued
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M3 Continued
Test N: The Power Seat Moves But Is Loose PINPOINT TEST N: THE POWER SEAT MOVES BUT IS LOOSE
N1-N2
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Component Tests SWITCH - MEMORY SET
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Memory Set Switch Remove the memory set switch. Measure the resistance between the following indicated terminals while pressing the requested switches.
The resistance should be less than 5 ohms for each switch position. If the resistance is not less than 5 ohms for each switch, install a new switch; otherwise, return to the calling Pinpoint Test.
NOTE: Refer to Multimeter User's Manual for testing diodes. To check the memory set switch LED, connect the positive meter lead to terminal 5 and the negative lead to terminal 6. The meter should indicate greater than 0.3 volts. Reversing the leads, the meter should read OL. If the meter readings are not as indicated above, install a new switch; otherwise, return to the calling Pinpoint Test.
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Symptom Chart (Part 1)
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Symptom Chart (Part 2)
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Symptom Chart (Part 3)
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