Pinpoint Test S: The Power Seats Are Inoperative - Third Row Power-Fold Seat
Seats
Pinpoint Tests
Pinpoint Test S: The Power Seats are Inoperative - Third Row Power-Fold Seat
Refer to Wiring Diagram Set 120, Power Seats for schematic and connector information. Diagrams By Number
Normal Operation
The third row power-fold seat relay is supplied battery voltage on circuits SBB12 (GN/RD) (right) and SBB05 (GY/RD) (left) and is hot at all times. The ground is supplied to each third row power-fold seat relay on the coil side through circuit CPS48 (BU) and controlled by the Smart Junction Box (SJB). The power-fold seat relays will be provided ground on the coil side from the SJB for 30 minutes when the transmission selector lever is in PARK, and the liftgate, or liftgate glass, is open. The ground will be disabled 30 minutes after turning the vehicle off. If the ground is disabled after 30 minutes, the ground 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.
- DTC B2794 (Third Row Power Fold Circuit Failure) - When SJB outputs to the left or right third row power-fold seat relay and short to voltage is present or when SJB output to the left or right third row power-fold seat relay is inactive and a short to ground is present, this DTC is set.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- SJB
PINPOINT TEST S: THE POWER SEATS ARE INOPERATIVE - THIRD ROW POWER-FOLD SEAT
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S1 CHECK DTCs
- Enter the following diagnostic mode on the scan tool: Self Test - GEM or SJB.
- Are any DTCs present?
Yes
If DTC B2794 is present, GO to S3.
For any other SJB DTCs, REFER to the Smart Junction Box (SJB) DTC Chart. Diagnostic Trouble Code Tests and Associated Procedures
No
GO to S2.
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S2 CHECK CIRCUIT GD149 (BK/GY) FOR AN OPEN
- Ignition OFF.
- Disconnect: Left Third Row Seat Control Switch C4179.
- Measure the resistance between:
- left third row seat control switch C4179-2, circuit GD149 (BK/GY), harness side and ground.
- left third row seat switch C4179-8, circuit GD149 (BK/GY), harness side and ground.
- Are the resistances less than 5 ohms?
Yes
INSTALL a new SJB. REFER to Body Control Systems. TEST the system for normal operation.
No
REPAIR the circuit. TEST the system for normal operation.
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S3 CHECK CIRCUIT CPS48 (BU) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: Left Third Row Seat Relay C4183.
- Disconnect: Right Third Row Seat Relay C4184.
- Disconnect: SJB C2280b.
- Ignition ON.
- Measure the voltage between left third row seat relay C4183-85, circuit CPS48 (BU), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit. CLEAR the DTCs. TEST the system for normal operation.
No
GO to S4.
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S4 CHECK CIRCUIT CPS48 (BU) FOR A SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between left third row seat relay C4183-85, circuit CPS48 (BU), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to S5.
No
REPAIR the circuit. TEST the system for normal operation.
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S5 CHECK CIRCUIT CPS48 (BU) FOR AN OPEN
- Measure the resistance between SJB C2280b-32, circuit CPS48 (BU), harness side and left third row seat relay C4183-85, circuit CPS48 (BU), harness side.
- Is the resistance less than 5 ohms?
Yes
INSTALL a new SJB. REFER to Body Control Systems. TEST the system for normal operation.
No
REPAIR the circuit. TEST the system for normal operation.
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