Pinpoint Test BC: The Power Seat is Inoperative/Does Not Operate Correctly - Right Rear, Power Fold
Seats
Pinpoint Tests
Pinpoint Test BC: The Power Seat is Inoperative/Does Not Operate Correctly - Right Rear, Power Fold
Refer to Wiring Diagram Set 120, Power Seats for schematic and connector information. Diagrams By Number
Normal Operation
The rear seat power-fold relay is provided voltage on the coil side from the Smart Junction Box (SJB), on pin 2, circuit CPS 48 (BU), for 30 minutes after turning the vehicle off, when the transmission selector is in PARK and the liftgate is open. Ground for the coil side of the relay is on pin 1, circuit GD120 (BK/GN). The rear seat power-fold relay switched side is supplied voltage from Battery Junction Box (BJB) fuse 27 (10A) on relay pin 3, and is hot at all times. Pushing the double-throw switch to the appropriate rear seat release actuator, left or right, will provide voltage from relay pin 5 and allow folding of that seat. If the relay is disabled after 30 minutes, it can be enabled as long as the transmission is in PARK by opening any door, pressing the unlock key on the key fob, pressing any keyless keypad button or turning the ignition key.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Rear seat control switch
- Right power-fold seat actuator
- Power-fold relay
PINPOINT TEST BC: THE POWER SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - RIGHT REAR, POWER FOLD
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BC1 CHECK RH SEAT OPERATION
- Ignition ON.
- Select NEUTRAL.
- Press the rear seat control switch to release the right side backrest.
- Does the RH seat operate all the time?
Yes
GO to BC2.
No
GO to BC3.
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BC2 CHECK CIRCUIT CPS58 (WH/BN) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: BJB Power-Fold Relay 25.
- Disconnect: Rear Seat Control Switch C4351.
- Ignition ON.
- Measure the voltage between rear seat control switch C4351-2, circuit CPS58 (WH/BN), harness side to ground.
- Is any voltage present?
Yes
REPAIR circuit CPS58 (WH/BN). TEST the system for normal operation.
No
INSTALL a new power-fold relay. TEST the system for normal operation.
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BC3 CHECK THE REAR SEAT CONTROL SWITCH
- Select PARK.
- Ignition OFF.
- Gain access to the rear seat control switch C4351.
- Back probe for voltage between rear seat control switch C4351-5, circuit CPS57 (GY/BN), harness side and ground.
- NOTE: If the relay is disabled after 30 minutes, it can be enabled by opening any door, pressing the unlock key on the key fob, pressing any keyless keypad button or turning the ignition key.
- While back probing for voltage, press the rear seat control switch to release the right side backrest.
- Is the voltage greater than 10 volts when rear seat control switch is depressed?
Yes
GO to BC4.
No
INSTALL a new rear seat control switch. REFER to Seat Control Switch - Rear Seat Seat Control Switch - Rear Seat. TEST the system for normal operation.
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BC4 CHECK CIRCUIT CPS57 (GY/BN) FOR AN OPEN
- Disconnect: Right Power-Fold Actuator C3334.
- Measure the voltage between right power-fold actuator C3334-1, circuit CPS57 (GY/BN), harness side and ground while pressing the rear seat control switch to release the right side backrest.
- Is the voltage greater than 10 volts when rear seat control switch is depressed?
Yes
GO to BC5.
No
REPAIR circuit CPS57 (GY/BN). TEST the system for normal operation.
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BC5 CHECK CIRCUIT GD151 (BK/GN) FOR AN OPEN
- Measure the voltage between right power-fold actuator C3334-1, circuit CPS57 (GY/BN), harness side and C3334-2, circuit GD151 (BK/GN), harness side while pressing the rear seat control switch to release the right side backrest.
- Is the voltage greater than 10 volts when rear seat control switch is depressed?
Yes
INSTALL a new right power-fold actuator. TEST the system for normal operation.
No
REPAIR the circuit GD151 (BK/GN). TEST the system for normal operation.
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