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: Power Rail 1 Motors Short to Battery / Short to GroundDTC B1335 0B: Power Rail 1 Motors Current Above Threshold
DTC B1335 42: Power Rail 1 Current Sensing Calibration Data Not Present
DTC B1335 4B: Power Rail 1 Current Sensing Calibration Data Out of Range
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Adjustable Pedal Forward Control | B3920 02 | 3 | B3920 01 | B1335 00, B1335 0B |
Adjustable Pedal Rearward Control | B3920 02 | 3 | B3920 01 | B1335 00, B1335 0B |
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 3. Adjustable pedals inoperative | ||||
Circuit/System Description
The memory seat module (MSM) monitors the current supplied to the driver seat adjuster motors, recline motor, lumbar motor, and the adjustable pedal motor. It can detect both absolute and differential current levels from the 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.
Conditions for Running the DTC
The 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, recline, lumbar, adjustable pedals 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
Electrical Information Reference
Scan Tool Reference
| • | Scan Tool Data List for the power seats |
| • | Scan Tool Data List for the adjustable pedals |
| • | Scan Tool Data Definitions for the power seats |
| • | Scan Tool Data Definitions for the adjustable pedals |
| • | Scan Tool Output Controls for the power seats |
| • | Scan Tool Output Controls for the adjustable pedals |
Circuit/System Testing
B1335 00 or B1335 0B
- Use a scan tool to clear the current and history diagnostic trouble code.
- 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.
- Use a scan tool to clear the current and history diagnostic trouble code.
- Ignition OFF, disconnect the harness connector at the motor for which the DTC set.
- Ignition ON, operate the motor in both directions then verify that the DTC set.
- Ignition OFF, disconnect the appropriate (C1, C4) harness connector at the MSM.
- Ignition ON, test for 0 volts between each motor control circuit and ground.
- Test for infinite resistance between each motor control circuit and ground.
- Test for infinite resistance between the motor control circuits:
- If all circuits test normal, 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 |
| • | Adjustable Pedal Motor |
| ⇒ | If the DTC did not set, test or replace the motor. |
| ⇒ | If greater than the specified value, test the control circuit for a short to voltage. |
| ⇒ | If less than the specified value, test the control circuit for a short to ground. |
| ⇒ | If less than the specified value, test for a short between the control circuits. |
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.
| • | Control Module References for MSM replacement, setup, and programming |
