For 1990-2009 cars

### 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 00: Device Power 3 Circuit
DTC B1335 0B: Device Power 3 Circuit Current Above Threshold
DTC 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 00, B1335 0B | 1 | B3920 01 | B1335 42, B1335 4B, B2355 5A
Driver Seat Front Vertical Motor Up Control | B3920 02 | B1335 00, B1335 0B | 1 | B3920 01 | B1335 42, B1335 4B, B2355 5A
Driver Seat Rear Vertical Motor Down Control | B3920 02 | B1335 00, B1335 0B | 1 | B3920 01 | B1335 42, B1335 4B, B2365 5A
Driver Seat Rear Vertical Motor Up Control | B3920 02 | B1335 00, B1335 0B | 1 | B3920 01 | B1335 42, B1335 4B, B2365 5A
Driver Seat Horizontal Motor Forward Control | B3920 02 | B1335 00, B1335 0B | 1 | B3920 01 | B1335 42, B1335 4B, B2375 5A
Driver Seat Horizontal Motor Rearward Control | B3920 02 | B1335 00, B1335 0B | 1 | B3920 01 | B1335 42, B1335 4B, B2375 5A
Driver Seat Recline Motor Forward Control | B3920 02 | B1335 00, B1335 0B | 1 | B3920 01 | B1335 42, B1335 4B, B1825 5A
Driver Seat Recline Motor Rearward Control | B3920 02 | B1335 00, B1335 0B | 1 | B3920 01 | B1335 42, B1335 4B, B1825 5A
Driver Seat Lumbar Motor Forward Control | B3920 02 | B1335 00, B1335 0B | 1 | B3920 01 | B1335 42, B1335 4B, B1850 5A
Driver Seat Lumbar Motor Rearward Control | B3920 02 | B1335 00, B1335 0B | 1 | B3920 01 | B1335 42, B1335 4B, B1850 5A
1. Power seat motor inoperative

### Circuit/System Description

The memory seat module (MSM) monitors the current supplied to the seat adjuster motors. The MSM 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 driver seat cushion motors or the lumbar horizontal motor must be active.

### Conditions for Setting the DTC

#### B1335 00

Current out of the module does not match the current returning to the module within 5 amps.

#### 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 driver seat adjuster motors are disabled.

### 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

Driver Seat Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

• | Power Seats System Description and Operation

• | Memory Seats 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 Testing

#### B1335 00 or B1335 0B

1. Ignition ON, use a scan tool to clear the current and history diagnostic trouble code.
2. 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.

• | Driver seat front vertical motor

• | Driver seat rear vertical motor

• | Driver seat horizontal motor

• | Driver seat recline motor

• | Driver seat lumbar horizontal motor

3. Clear the diagnostic trouble codes.
4. Ignition OFF, disconnect the harness connector at the appropriate seat or lumbar motor for which the DTC set.
5. Ignition ON, operate the motor adjuster switch in both directions. DTC B1335 00 or B1335 0B should not set.

⇒ | If the DTC sets, test for a short between the appropriate motor control circuits listed below. If the circuits test normal, replace the MSM.

• | Front vertical motor terminal 1 and terminal 2

• | Rear vertical motor terminal 1 and terminal 2

• | Seat horizontal motor terminal 1 and terminal 2

• | Seat recline motor terminal 1 and terminal 2

• | Lumbar horizontal motor terminal 1 and terminal 5

6. Test the appropriate control circuits listed below for a high resistance. If the circuits test normal, test or replace the seat or lumbar motor.

• | Front vertical motor terminal 1 and terminal 2

• | Rear vertical motor terminal 1 and terminal 2

• | Seat horizontal motor terminal 1 and terminal 2

• | Seat recline motor terminal 1 and terminal 2

• | Lumbar horizontal motor terminal 1 and terminal 5

#### DTC B1335 42 or B1335 4B

Verify that DTC B1335 42 or B1335 4B is not set.

⇒ | If either DTC is set, replace the MSM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Front Seat Recliner Actuator Motor Replacement

• | Front Seat Lumbar Support Replacement

• | Control Module References for MSM replacement, setup, and programming