• | 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. |
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
---|---|---|---|---|---|
Driver Seat Lumbar Motor Up Control | B3921 02 | B1340 00, B1340 0B | 1 | B3921 01 | B1340 42, B1340 4B, B1860 5A |
Driver Seat Lumbar Motor Down Control | B3921 02 | B1340 00, B1340 0B | 1 | B3921 01 | B1335 42, B1335 4B, B1860 5A |
Steering Column Telescope Motor Forward Control | B3921 02 | B1340 00, B1340 0B | 2 | B3921 01 | B1335 42, B1335 4B, B2860 5A |
Steering Column Telescope Motor Rearward Control | B3921 02 | B1340 00, B1340 0B | 2 | B3921 01 | B1335 42, B1335 4B, B2860 5A |
Steering Column Tilt Motor Down Control | B3921 02 | B1340 00, B1340 0B | 3 | B3921 01 | B1335 42, B1335 4B, B2880 5A |
Steering Column Tilt Motor Up Control | B3921 02 | B1340 00, B1340 0B | 3 | B3921 01 | B1335 42, B1335 4B, B2880 5A |
1. Lumbar vertical motor is inoperative 2. Steering Column Does Not Telescope In/Out 3. Steering Column Does Not Tilt Up/Down |
The memory seat module (MSM) monitors the current supplied to both steering column motors and the lumbar vertical motor. The MSM can detect both absolute and differential current levels from the these motors. Absolute current is the maximum allowable current the module will supply to the motors. A differential current mismatch occurs when the current supplied to the motors does not match the current returning from the motors.
The lumbar vertical motor or the steering column motors must be active.
Current out of the module does not match the current returning to the module within 5 amps.
The absolute current has exceeded the maximum value allowed.
This DTC will set if the module calibration is not programmed.
This DTC will set if the module calibration is not learned.
All movement related to the seat lumbar motor and steering column motors are aborted.
• | The current DTC will clear and set the code to history, 3 seconds after no motor movement is requested or the current is no longer mismatched, and the power mode changes to OFF then back to ACC or RUN. |
• | The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred. |
The scan tool may reference the Memory Seat Module (MSM) as the Driver Position Module.
Memory Seats Description and Operation
Control Module References for scan tool information
• | Driver Seat Lumbar Vertical Motor |
• | Steering Column Tilt Motor |
• | Steering Column Telescope Motor |
⇒ | If the DTC sets, test for a short between the appropriate motor control circuits listed below. If the circuits test normal, replace the MSM. |
• | Lumbar vertical motor terminal 1 and terminal 5 |
• | Steering column telescope motor terminal C and terminal D |
• | Steering column tilt motor terminal A and terminal B |
• | Lumbar vertical motor terminal 1 and terminal 5 |
• | Steering column telescope motor terminal C and terminal D |
• | Steering column tilt motor terminal A and terminal B |
If either DTC is set, replace the MSM.
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for MSM replacement, programming and setup |