DTC B1B29-B1B2C
Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptors DTC B1B29 Left 3rd Row Seat Left Latch Signal DTC B1B2A Left 3rd Row Seat Right Latch Signal DTC B1B2B Right 3rd Row Seat Left Latch Signal DTC B1B2C Right 3rd Row Seat Right Latch Signal Symptom Byte Information: Symptom Byte List Diagnostic Fault Information
| Circuit Number | Circuit Function | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performan |
|---|---|---|---|---|---|
| 2694 | Signal | B1B29:23 | 1 | B1B29:24 | — |
| 2695 | Signal | B1B2A:23 | 1 | B1B2A:24 | — |
| 2696 | Signal | B1B2B:23 | 1 | B1B2B:24 | — |
| 2697 | Signal | B1B2C:23 | 1 | B1B2C:24 | — |
| 5474 | Ground | — | 1 | — | — |
| 1. 3rd row folding seat inoperative |
Circuit/System Description The power folding third row seat system consists of folding seat switches, a control module, a seat back release actuator, a hall-effect position sensor, and the folding seat motor. The third row folding seat switches are located on the D-pillar. Voltage to the switches is supplied through the park enable relay while in a de-energized state. The park enable relay is controlled by the body control module (BCM) through a high side drive control circuit and will be de-energized whenever the ignition is in the accessory or run positions and the transmission is in park. Battery voltage is supplied to the folding seat control module through a 30 A fuse located in the rear body fuse block. When a folding seat switch is pressed, battery voltage is applied through the switch contacts and the signal circuit to the folding seat control module indicating the folding seat request. In response to this signal, the module applies a PWM voltage through the seat back release actuator control circuit energizing the actuator. With the actuator energized and the seat back released, the control module applies battery voltage and ground through the folding seat motor control circuits to the motor. The motor runs to either move the seat back cushion to the folded or unfolded seat position. The control module supplies the hall-effect sensor with a low reference and a signal circuit. The module monitors the voltage from the signal circuit in order to detect a seat stall condition. If the module does not detect seat movement within 400ms, it will cease folding seat operation. Conditions for Running the DTC Ignition ON Conditions for Setting the DTC B1B29 23, B1B2A 23, B1B2B 23, or B1B2C 23 The K169 Folding 3rd Row Seat Module detects a stuck low signal. B1B29 24, B1B2A 24, B1B2B 24, or B1B2C 24 The K169 Folding 3rd Row Seat Module detects a stuck high signal. Action Taken When the DTC Sets The K169 Folding 3rd Row Seat Module will disable all seat functions. Conditions for Clearing the DTC The DTC clears when the diagnostic runs and passes. The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred. Reference Information Schematic Reference Rear Seat Schematics Connector End View Reference Master Electrical Component List Description and Operation Power Seats System Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for scan tool information Circuit/System Verification
- Ignition ON.
- Verify DTC B1B29 – B1B2C is not set. ⇒ If the DTC is set Refer to Circuit/System Testing. ⇓ If the DTC is not set
- A fault is currently not present and may be an intermittent condition. Circuit/System Testing
- Ignition OFF, disconnect the appropriate component listed below: DTC B1B29 = Folding Seat Unlatch Switch – 3rd Row Left Outer DTC B1B2A = Folding Seat Unlatch Switch – 3rd Row Left Inner DTC B1B2B = Folding Seat Unlatch Switch – 3rd Row Right Inner DTC B1B2C = Folding Seat Unlatch Switch – 3rd Row Right Outer
- Test for less than 10 Ω between the low reference circuit terminal 2 and ground: ⇒ If 10 Ω or greater 2.1. Test circuit 5474 for a open/high resistance. ⇒ If an open/high resistance is found, repair the fault on the circuit. ⇓ If an open/high resistance is not found 2.2. Replace the K169 Folding 3rd Row Seat Module. ⇓ If less than 10 Ω
- Ignition/Vehicle in Service Mode.
- Test for 4.8–5.2 Volts between signal circuit terminal 1 and ground. ⇒ If less than 4.8 V 4.1. Test the appropriate circuit for a short to ground. Folding Seat Unlatch Switch – 3rd Row Left Outer = Circuit 2694 Folding Seat Unlatch Switch – 3rd Row Left Inner = Circuit 2695 Folding Seat Unlatch Switch – 3rd Row Right Inner = Circuit 2696 Folding Seat Unlatch Switch – 3rd Row Right Outer = Circuit 2697 ⇒ If a short to ground is found, repair the fault on the circuit. ⇓ If a short to ground is not found 4.2. Test the appropriate circuit for an open/high resistance. Folding Seat Unlatch Switch – 3rd Row Left Outer = Circuit 2694 Folding Seat Unlatch Switch – 3rd Row Left Inner = Circuit 2695 Folding Seat Unlatch Switch – 3rd Row Right Inner = Circuit 2696 Folding Seat Unlatch Switch – 3rd Row Right Outer = Circuit 2697 ⇒ If an open/high resistance is found, repair the fault on the circuit. ⇓ If an open/high resistance is not found 4.3. Replace the K169 Folding 3rd Row Seat Module. ⇒ If greater than 5.2 V 4.1. Test the appropriate circuit for a short to voltage. Folding Seat Unlatch Switch – 3rd Row Left Outer = Circuit 2694 Folding Seat Unlatch Switch – 3rd Row Left Inner = Circuit 2695 Folding Seat Unlatch Switch – 3rd Row Right Inner = Circuit 2696 Folding Seat Unlatch Switch – 3rd Row Right Outer = Circuit 2697 ⇒ If a short to voltage is found, repair the fault on the circuit. ⇓ If a short to voltage is not found 4.2. Replace the K169 Folding 3rd Row Seat Module. ⇓ If between 4.8–5.2 V
- Replace the appropriate component listed below: Folding Seat Unlatch Switch – 3rd Row Left Outer Folding Seat Unlatch Switch – 3rd Row Left Inner Folding Seat Unlatch Switch – 3rd Row Right Inner Folding Seat Unlatch Switch – 3rd Row Right Outer Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Control Module References for K169 Folding 3rd Row Seat Module replacement, programming, and setup.