B1335

DTC B1335

DTC DESCRIPTORS
This diagnostic procedure supports the following DTCs:
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

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection

CIRCUIT/SYSTEM DESCRIPTION
The memory seat module (MSM) monitors the current supplied to the driver seat front vertical, rear vertical, horizontal, recline and lumbar horizontal 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 MSM establishes that it is not closing to a shorted motor control circuit before the motors are active.

CONDITIONS FOR SETTING THE DTC

B1335 00: Current out of the module does not match the current returning to the module within 1 amp.
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.
B1935 42: This DTC will set if the module calibration is lost.
B1335 4B: This DTC will set if the module calibration is not learned.

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 3 seconds after no motor movement is requested or the current is no longer mismatched.
- The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.

MODULE INTERNAL MALFUNCTION
If DTCs B1335 42 or B1335 4B are set history or current, the only option is module replacement.

CIRCUIT/SYSTEM TESTING

DTCs B1335 42 or B1335 4B: If either DTC is set history or current, the only option is module replacement.

DTCs 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
3. Use a scan tool to clear the current and history diagnostic trouble code.
4. Ignition OFF, disconnect the harness connector at the seat 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 harness connector at the memory seat module.
7. Ignition ON, test for 0 volts between each motor control circuit and ground.
- If greater than 0 volts, 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 the control circuits for a short together.
10. If all circuits test normal, test or replace the memory seat module.

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.
- Seat Adjuster Replacement - Front
- Power Recliner Motor Replacement - Front Seat
- Lumbar Replacement - Front Seat (with AL2) Lumbar Replacement - Front Seat (with AM3)
- Control Module References for MSM replacement, setup, and programming