Diagnostic Instructions

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	Open/High Resistance	Short to Voltage	Signal Performance
Driver Seat Front Vertical Motor Down Control	B3920 02	1	B3920 01	B1335 00, B1335 0B
Driver Seat Front Vertical Motor Up Control	B3920 02	1	B3920 01	B1335 00, B1335 0B
Driver Seat Horizontal Motor Forward Control	B3920 02	1	B3920 01	B1335 00, B1335 0B
Driver Seat Horizontal Motor Rearward Control	B3920 02	1	B3920 01	B1335 00, B1335 0B
Driver Seat Lumbar Horizontal Motor Forward Control	B3920 02	2	B3920 01	B1335 00, B1335 0B
Driver Seat Lumbar Horizontal Motor Rearward Control	B3920 02	2	B3920 01	B1335 00, B1335 0B
Driver Seat Lumbar Vertical Motor Down Control	B3920 02	2	B3920 01	B1335 00, B1335 0B
Driver Seat Lumbar Vertical Motor Up Control	B3920 02	2	B3920 01	B1335 00, B1335 0B
Driver Seat Rear Vertical Motor Down Control	B3920 02	1	B3920 01	B1335 00, B1335 0B
Driver Seat Rear Vertical Motor Up Control	B3920 02	1	B3920 01	B1335 00, B1335 0B
Driver Seat Recline Motor Forward Control	B3920 02	1	B3920 01	B1335 00, B1335 0B
Driver Seat Recline Motor Rearward Control	B3920 02	1	B3920 01	B1335 00, B1335 0B
1. Power Seat Inoperative with Memory - A45 2. Lumbar Support inoperative with Memory - A45

Circuit/System Description

The memory seat module (MSM) monitors the current supplied to the driver seat adjuster motors, recline motor and both 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 motors must be active.

Conditions for Setting the DTC

B1335 00

Current out of the module does not match the current returning to the module from 1.5-5 A.

B1335 0B

The differential current measured through the high and low side of the power rail is within tolerance of each other, but the absolute current or an over-current has exceeded the maximum value.

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

Reference Information

Schematic Reference

Driver Seat Schematics

Connector End View Reference

Power Seat Connector End Views

Electrical Information Reference

Scan Tool Reference

Circuit/System Testing

B1335 00 or B1335 0B

1. Use a scan tool to clear the current and history diagnostic trouble code.
2. Ignition ON, determine which motor set this DTC by operating the following motors 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

•	Driver seat lumbar vertical motor

3. Use a scan tool to clear the current and history diagnostic trouble code.
4. Ignition OFF, disconnect the harness connector at the seat or lumbar motor for which the DTC set.
5. Ignition ON, operate the motor in both directions then verify that the DTC set.

⇒	If the DTC did not set, test or replace the motor.

6. Ignition OFF, disconnect the appropriate (C1, C4) harness connector at the MSM.
7. Ignition ON, test for 0 volt between each motor control circuit and ground.

⇒	If greater than 0 volt, test the control circuit for a short to voltage.

8. Test for infinite resistance between each control circuit and ground.

⇒	If less than infinite resistance, repair the control circuit for a short to ground.

9. Test for infinite resistance between the motor control circuits:

⇒	If less than infinite resistance, test for a short between the control circuits.

10. If all circuits test normal, test or replace the MSM.

B1335 42 or B1335 4B

If either DTC is set, the only option is module replacement.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.