Pinpoint Test X: The Power Seat Is Inoperative/Does Not Operate Correctly - Both Rear, Power Fold

Seats

Pinpoint Test X: The Power Seat is Inoperative/Does Not Operate Correctly - Both Rear, Power Fold

Refer to Wiring Diagram Set 120, Power Seats for schematic and connector information Electrical Diagrams.

Normal Operation

The rear seat release relay, located in the Battery Junction Box (BJB), is controlled by the Body Control Module (BCM). The BCM (Body Control Module) activates the rear seat release relay by providing voltage to the coil side for 30 minutes after turning the vehicle off, when the transmission selector is in PARK and the liftgate is open. Ground is provided at all times to the other side of the coil. When the rear seat release relay is activated, voltage is supplied to the rear power seat release switch. When the rear power seat release switch is activated, voltage is supplied to the appropriate rear seat release actuator, left or right, to allow folding of that seat. If the rear seat release relay has been deactivated after 30 minutes, it can be reactivated 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 cycling the ignition.

- DTC B1317:11 (Third Row Power Fold Seat Output: Circuit Short To Ground)- sets when the BCM (Body Control Module) output to the rear seat release relay is shorted to ground.

- DTC B1317:15 (Third Row Power Fold Seat Output: Circuit Short To Battery or Open)- sets when the BCM (Body Control Module) output to the rear seat release relay is open or shorted to voltage.

This pinpoint test is intended to diagnose the following:

- Fuse

- Wiring, terminals or connectors

- BCM (Body Control Module)

- Rear seat release relay

- Rear power seat release switch

PINPOINT TEST X : THE POWER SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - BOTH REAR, POWER FOLD

X1 CHECK FOR DTCs

- Enter the following diagnostic mode on the scan tool: Self Test- BCM (Body Control Module).

Are any DTCs present?

Yes
If DTC B1317:15 is present, GO to X2.

If DTC B1317:11 is present, GO to X5.

For all other DTCs, GO to the appropriate system for diagnosis or REFER to Body Control Systems.

No
GO to X2.

X2 CHECK THE OPERATION OF THE POWER-FOLD REAR SEAT

- NOTE: Shifting the transmission out of PARK disables the voltage supply from the BCM (Body Control Module) to the rear seat release relay.
Operate both power-fold rear seats.


Do both power-fold rear seats operate at all times?

Yes
If DTC B1317:15 is present and the power-fold rear seats operate at all times, GO to X4.

If both power-fold rear seats operate at all times, and no DTCs were present, GO to X3.

No
If DTC B1317:15 is present and neither power-fold rear seat operates, GO to X6.

If no DTCs were present and neither power-fold rear seat operates, GO to X3.

X3 CHECK THE PCM TRANSMISSION RANGE (TR) PID STATES

- Enter the following diagnostic mode on the scan tool: DataLogger- PCM PID: TR.

- Operate the transmission gear selector in all positions while monitoring the PCM PID TR states.

Do the PID states agree with the selected positions?

Yes
If no DTCs were present and neither power-fold rear seat works, GO to X9.

If no DTCs were present and both power-fold rear seat work all the time, GO to X14.

No
To diagnose a transmission gear selector (PRNDL) status concern, REFER to Automatic Transmission/Transaxle &/or Transmission Control Systems.

X4 CHECK THE REAR SEAT RELEASE RELAY CONTROL CIRCUIT FOR A SHORT TO VOLTAGE

- Ignition OFF.

- Disconnect: Rear Seat Release Relay.

- Disconnect: BCM (Body Control Module) C2280C.

- Ignition ON.

- Measure the voltage between BCM (Body Control Module) C2280C-2, circuit CPS45 (VT/OG), harness side and ground.






Is any voltage present?

Yes
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

No
INSTALL a new BCM (Body Control Module). REPEAT the self-test. TEST the system for normal operation.

X5 CHECK THE REAR SEAT RELEASE RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND

- Ignition OFF.

- Disconnect: BCM (Body Control Module) C2280C.

- Disconnect: Rear Seat Release Relay.

- Measure the resistance between BCM (Body Control Module) C2280C-2, circuit CPS45 (VT/OG), harness side and ground.






Is the resistance greater than 10,000 ohms?

Yes
INSTALL a new BCM (Body Control Module). REPEAT the self-test. TEST the system for normal operation.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

X6 CHECK THE REAR SEAT RELEASE RELAY GROUND CIRCUIT FOR AN OPEN

- Ignition OFF.

- Disconnect: Rear Seat Release Relay.

- Measure the resistance between rear seat release relay socket pin 1, circuit GD120 (BK/GN) and ground.






Is the resistance less than 5 ohms?

Yes
GO to X7.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

X7 CHECK THE REAR SEAT RELEASE RELAY CONTROL CIRCUIT FOR AN OPEN

- Disconnect: BCM (Body Control Module) C2280C.

- Connect a fused jumper wire between rear seat release relay, socket pin 1, circuit GD120 (BK/GN) and rear seat release relay, socket pin 2, circuit CPS45 (VT/OG).

- Measure the resistance between BCM (Body Control Module) C2280C-2, circuit CPS45 (VT/OG), harness side and ground.






Is the resistance less than 5 ohms?

Yes
GO to X8.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

X8 CHECK THE REAR SEAT RELEASE RELAY

- Carry out the component test for the rear seat release relay.

Is the rear seat release relay OK?

Yes
INSTALL a new BCM (Body Control Module). REPEAT the self-test. TEST the system for normal operation.

No
INSTALL a new rear seat release relay. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

X9 CHECK THE REAR SEAT RELEASE RELAY CONTROL CIRCUIT FOR VOLTAGE

- Make sure the transmission is in PARK.

- Activate the power-fold rear seats by carrying out one of the following within 30 minutes of checking circuit CPS45 (VT/OG) for voltage.
- Open 1 of the 4 doors or the liftgate
- Turn the ignition to ACC or ON
- Press a keyless entry keypad button
- Press a Remote Keyless Entry (RKE) button


- Disconnect: Rear Seat Release Relay.

- Measure the voltage between rear seat release relay socket pin 2, circuit CPS45 (VT/OG), and ground.






Is the voltage greater than 10 volt?

Yes
GO to X10.

No
INSTALL a new BCM (Body Control Module). REPEAT the self-test. TEST the system for normal operation.

X10 CHECK THE REAR SEAT RELEASE RELAY GROUND CIRCUIT FOR AN OPEN

- Ignition OFF.

- Measure the resistance between rear seat release relay socket pin 1, circuit GD120 (BK/GN), and ground.






Is the resistance less than 5 ohms?

Yes
GO to X11.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

X11 CHECK THE REAR SEAT RELEASE RELAY

- Carry out the component test for the rear seat release relay.

Is the rear seat release relay OK?

Yes
GO to X12.

No
INSTALL a new rear seat release relay. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

X12 CHECK THE REAR SEAT RELEASE RELAY SUPPLY CIRCUIT FOR VOLTAGE

- Measure the voltage at rear seat release relay socket pin 3, and ground.






Is the voltage greater than 10 volts?

Yes
GO to X13.

No
VERIFY BJB (Battery Junction Box) fuse 61 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams to identify possible causes of the circuit short Electrical Diagrams. TEST the system for normal operation.

X13 CHECK THE REAR POWER SEAT RELEASE SWITCH CIRCUIT FOR AN OPEN

- Connect: Rear Seat Release Relay.

- Disconnect: Rear Power Seat Release Switch C4351.

- Open the liftgate.

- 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 cycling the ignition.
Measure the voltage between rear power seat release switch C4351-2, circuit CPS58 (WH/BN), harness side and ground.







Is the voltage greater than 10 volts?

Yes
INSTALL a new rear power seat release switch. REFER to Seat Control Switch - Rear Seat . TEST the system for normal operation.

No
REPAIR the circuit. TEST the system for normal operation.

X14 CHECK THE REAR POWER SEAT RELEASE SWITCH CIRCUIT FOR A SHORT TO VOLTAGE

- Ignition OFF.

- Disconnect: Rear Seat Release Relay.

- Ignition ON.

- Using the rear power seat release switch, attempt to fold the rear left and right seats down.

Did the rear left and right seats fold down?

Yes
REPAIR circuit CPS58 (WH/BN) for a short to voltage. TEST the system for normal operation.

No
GO to X15.

X15 CHECK THE REAR SEAT RELEASE RELAY

- Carry out the component test for the rear seat release relay.

Is the rear seat release relay OK?

Yes
INSTALL a new BCM (Body Control Module). TEST the system for normal operation.

No
INSTALL a new rear seat release relay. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.