Pinpoint Test U: The Power Seat Is Inoperative/Does Not Operate Correctly - Third Row Power-Fold Seat, Right
Seats
Pinpoint Tests
Pinpoint Test U: The Power Seat is Inoperative/Does Not Operate Correctly - Third Row Power-Fold Seat, Right
Refer to Wiring Diagram Set 120, Power Seats for schematic and connector information. Diagrams By Number
Normal Operation
The right third row power-fold seat relay coil side is supplied battery voltage on circuit SBB12 (GN/RD) and is hot at all times. The ground is supplied to the right third row power-fold seat relay on the coil side through circuit CPS48 (BU) and controlled by the Smart Junction Box (SJB). When the right third row power-fold seat control switch is pressed, voltage is supplied through the switch side of the left third row power-fold seat relay on circuit SBB12 (GN/RD) and supplied ground on circuit GD149 (BK/GY). When pressing the right third row power-fold seat control switch in the opposite direction, the right third row power-fold seat control switch reverses the polarity to the right third row power-fold seat motor, which moves the third row seat backrest in the opposite direction.
This pinpoint test is intended to diagnose the following:
- Fuse(s)
- Wiring, terminals or connectors
- Right third row power-fold seat control switch
- Right third row power-fold seat relay
- Right third row power-fold seat motor
- SJB
PINPOINT TEST U: THE POWER SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - THIRD ROW POWER-FOLD SEAT, RIGHT
NOTE: The SJB may also be identified as the Generic Electronic Module (GEM).
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U1 CHECK RH SEAT OPERATION
- Turn the ignition on and place the transmission in NEUTRAL.
- Does the RH seat operate?
Yes
GO to U2.
No
GO to U3.
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U2 CHECK CIRCUIT CPS54 (WH/OG) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: Right Third Row Seat Switch C4184.
- Ignition ON.
- Measure the voltage between right third row seat relay C4184-87, circuit CPS54 (WH/OG), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit. TEST the system for normal operation.
No
INSTALL a new right third row seat relay. TEST the system for normal operation.
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U3 CHECK CIRCUIT SBB12 (GN/RD) FOR AN OPEN
- Ignition OFF.
- Disconnect: Right Third Row Seat Relay C4184.
- Measure the voltage between:
- right third row seat relay C4184-30, circuit SBB12 (GN/RD), harness side and ground.
- right third row seat relay C4184-86, circuit SBB12 (GN/RD), harness side and ground.
- Are the voltages greater than 10 volts?
Yes
GO to U4.
No
VERIFY Battery Junction Box (BJB) fuse 12 (30A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams to identify possible causes of the circuit short. TEST the system for normal operation. Diagrams By Number
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U4 CHECK RIGHT THIRD ROW SEAT RELAY
- Carry out component test on the right third row seat relay.
- Did the relay pass?
Yes
GO to U5.
No
INSTALL a new right third row seat relay. TEST the system for normal operation.
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U5 CHECK CIRCUIT CPS48 (BU) FOR AN OPEN
- Disconnect: Left Third Row Seat Relay C4183.
- Disconnect: SJB C2280b.
- Measure the resistance between right third row seat relay C4184-85, circuit CPS48 (BU), harness side and SJB C2280b-32, circuit CPS48 (BU), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to U6.
No
REPAIR the circuit. TEST the system for normal operation.
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U6 CHECK CIRCUIT CPS54 (WH/OG) FOR AN OPEN
- Disconnect: Right Third Row Seat Control Switch C4180.
- Measure the resistance between right third row power-fold seat relay C4184-87, circuit CPS54 (WH/OG), harness side and right third row power-fold seat control switch C4180-4, circuit CPS54 (WH/OG), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to U7.
No
REPAIR the circuit. TEST the system for normal operation.
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U7 CHECK CIRCUIT GD149 (BK/GY) FOR AN OPEN
- Measure the resistance between:
- right third row seat switch C4180-8, circuit GD149 (BK/GY), harness side and ground.
- right third row seat switch C4180-2, circuit GD149 (BK/GY), harness side and ground.
- Are the resistances less than 5 ohms?
Yes
GO to U8.
No
REPAIR the circuit. TEST the system for normal operation.
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U8 CHECK RIGHT THIRD ROW POWER-FOLD SEAT CONTROL SWITCH
- Disconnect: Right Third Row Power-Fold Seat Control Switch C4180.
- Using the following table, check the right third row power-fold seat control switch. Measure the resistance between the right third row power-fold seat control switch pins, component side, while pressing the indicated switch buttons and compare the results to the table. The resistance measurement must fall within the tolerance given.
- Carry out the Third Row Power-Fold Seat Control Switch Component Test.
- Did the switch pass?
Yes
GO to U9.
No
INSTALL a new switch. REFER to Seat Control Switch - Third Row Seat Control Switch - Third Row. TEST the system for normal operation.
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U9 CHECK CIRCUITS CPS51 (VT/GY) AND CPS52 (YE/GN) FOR AN OPEN
- Disconnect: Right Third Row Seat Motor C4182.
- Measure the resistance between:
- right third row seat switch C4180-3, circuit CPS52 (YE/GN), harness side and right third row seat motor C4182-1, circuit CPS52 (YE/GN) harness side.
- right third row seat switch, C4180-7, circuit CPS51 (VT/GY), harness side and right third row seat motor C4182-2, circuit CPS51 (VT/GY), harness side.
- Are the resistances less than 5 ohms?
Yes
INSTALL a new right third row power seat motor. REFER to Power-Fold Seat Motor - Third Row Power-Fold Seat Motor - Third Row. TEST the system for normal operation.
No
REPAIR the circuit(s). TEST the system for normal operation.
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