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 B1335 0B: Device Power 3 Circuit Current Above ThresholdDTC B1335 42: Device Power 3 Circuit Calibration Data Set Not Programed
DTC B1335 4B: Device Power 3 Circuit Calibration Not Learned
Diagnostic Fault Information
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
Driver Seat Front Vertical Motor Down Control | B3920 02 | B1335 0B | 1 | B3920 01 | B1335 42, B1335 4B, B2355 5A |
Driver Seat Front Vertical Motor Up Control | B3920 02 | B1335 0B | 1 | B3920 01 | B1335 42, B1335 4B, B2355 5A |
Driver Seat Rear Vertical Motor Down Control | B3920 02 | B1335 0B | 1 | B3920 01 | B1335 42, B1335 4B, B2365 5A |
Driver Seat Rear Vertical Motor Up Control | B3920 02 | B1335 0B | 1 | B3920 01 | B1335 42, B1335 4B, B2365 5A |
Driver Seat Horizontal Motor Forward Control | B3920 02 | B1335 0B | 1 | B3920 01 | B1335 42, B1335 4B, B2375 5A |
Driver Seat Horizontal Motor Rearward Control | B3920 02 | B1335 0B | 1 | B3920 01 | B1335 42, B1335 4B, B2375 5A |
Driver Seat Recline Motor Forward Control | B3920 02 | B1335 0B | 1 | B3920 01 | B1335 42, B1335 4B, B1825 5A |
Driver Seat Lumbar Motor Forward Control | B3920 02 | B1335 0B | 2 | B3920 01 | B1335 42, B1335 4B, B1850 5A |
Driver Seat Lumbar Motor Rearward Control | B3920 02 | B1335 0B | 2 | B3920 01 | B1335 42, B1335 4B, B1850 5A |
1. Power seat motor inoperative 2. Lumbar motor inoperative | |||||
Circuit/System Description
The memory seat module (MSM) monitors the current supplied to the driver seat adjuster motors, recline motor and the lumbar motors. It can detect both absolute and differential current levels from the seat 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 seat motors does not match the current returning from the motors.
Conditions for Running the DTC
The seat adjuster motors, recline motor or the lumbar motor must be active.
Conditions for Setting the DTC
B1335 0B
The absolute current or an over-current has exceeded the maximum value allowed.
B1335 42
This DTC will set if the module calibration is not programmed.
B1335 4B
This DTC will set if the module calibration is out of range.
Action Taken When the DTC Sets
All movement related to the seat cushion motors, recline and driver seat lumbar motors is aborted.
Conditions for Clearing the DTC
| • | 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 ignition is cycled OFF then back to ACC or RUN. |
| • | The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Memory Seats Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
B1335 0B
- Ignition ON, use a scan tool to clear the current and history diagnostic trouble code.
- Determine which motor set this DTC by operating the motors listed below one at a time in both directions. Check for the DTC to set between each motor test.
- Clear the diagnostic trouble codes.
- Ignition OFF, disconnect the harness connector at the appropriate seat or lumbar motor for which the DTC set.
- Ignition ON, operate the motor adjuster switch in both directions. DTC B1335 0B should not set.
- Test the appropriate control circuits listed below for a high resistance. If the circuits test normal, test or replace the seat or lumbar motor.
- If all circuits test normal, test or replace the MSM.
| • | Driver seat front vertical motor |
| • | Driver seat rear vertical motor |
| • | Driver seat horizontal motor |
| • | Driver seat recline motor |
| • | Driver seat lumbar horizontal motor |
| ⇒ | If the DTC sets, test for a short between the appropriate control circuits listed below. If the circuits test normal, replace the MSM. |
| • | Driver seat front vertical motor terminal 1 and terminal 5 |
| • | Driver seat rear vertical motor terminal 1 and terminal 5 |
| • | Driver seat horizontal motor terminal 1 and terminal 5 |
| • | Driver seat recline motor terminal 1 and terminal 5 |
| • | Driver seat lumbar horizontal motor terminal A and terminal B |
| • | Driver seat front vertical motor terminal 1 and terminal 5 |
| • | Driver seat rear vertical motor terminal 1 and terminal 5 |
| • | Driver seat horizontal motor terminal 1 and terminal 5 |
| • | Driver seat recline motor terminal 1 and terminal 5 |
| • | Driver seat lumbar horizontal motor terminal A and terminal B |
B1335 42 or B1335 4B
If either DTC is set, replace the MSM.
Component Testing
Seat Motor
- Ignition OFF, disconnect the harness connector at the appropriate seat motor.
- Install a 30 A fused jumper wire between the control terminal 1 and 12 volts. Momentarily install a jumper wire between the control terminal 5 and ground. The seat motor should momentarily perform the appropriate FORWARD/REARWARD/UP/DOWN function.
- Reverse the polarity of jumper wires. The a seat motor should perform in the opposite direction.
Important: When performing the following tests, make sure that the seat is not already in the position the test is attempting to produce.
| ⇒ | If the function does not perform as specified, replace the seat motor. |
| ⇒ | If the function does not perform as specified, replace the seat motor. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for MSM replacement, setup, and programming |
