B1335
DTC B1335
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B1335
- Device Power 3 Circuit Current Above Threshold
Diagnostic Fault Information
Circuit/System Description
Battery positive voltage is supplied at all times to the memory seat module (MSM) through the battery positive voltage circuit from the SEATS circuit breaker located in the left rear fuse block. This voltage is used to power up the MSM and also to apply power to the seat motors when commanded. Each seat, lumbar and steering column motor is controlled by the MSM through 2 motor control circuits. While the motors are in an inactive state, the motor control circuits are closed to ground circuit contacts within the MSM. During memory recall and manual control functions, the motor current is monitored through the motor control circuits by the MSM. When an overcurrent condition is detected by the MSM, it will disable the appropriate motors in order to prevent the internal MSM circuitry from damage.
Conditions for Running the DTC
Battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
This DTC will set when the MSM detects a short to ground on a motor control circuit for 100 milliseconds or more.
Actions Taken When the DTC Sets
* The memory seat functions for the affected seat will be disabled.
* The MSM will disable manual movements of the affected motor.
Conditions for Clearing the DTC
* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred.
Diagnostic Aids
The memory seat module (MSM) is also referred to as the driver position module (DPM) in certain scan tool menus.
Reference Information
Schematic Reference
Driver Seat Schematics (Driver Seat Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Memory Seats Description and Operation (Memory Seats)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Testing
1. Ignition ON, use a scan tool clear the current and history DTC.
2. Determine which motor set the 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 horizontal lumbar motor
* Driver seat vertical lumbar motor
* Driver seat recline motor
* Steering column telescope motor
* Steering column tilt motor
3. Clear the diagnostic trouble code.
4. Ignition OFF, disconnect the harness connector at the appropriate seat, lumbar, or steering column motor listed below for which the DTC set.
* Seat adjuster assembly X1
* Seat recline motor X1
* Lumbar horizontal motor X1
* Lumbar vertical motor X2
* Steering column telescope motor X1
* Steering column tilt motor X1
5. Ignition ON, operate the motor adjuster switch in both directions. DTC B1335 0B should not set.
• If the DTC sets, test for a short to ground or a short between the appropriate control circuits listed below: If the circuits test normal, replace the MSM.
* Front vertical motor terminal 2 and terminal 5
* Rear vertical motor terminal 1 and terminal 4
* Seat horizontal motor terminal 3 and terminal 6
* Seat recline motor terminal A and terminal B
* Lumbar vertical motor terminal A and terminal B
* Lumbar horizontal motor terminal A and terminal B
* Steering column telescope motor terminal A and terminal B
* Steering column tilt motor terminal A and terminal B
6. If all circuits test normal, test or replace the appropriate seat, lumbar or steering column motor assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Front Seat Adjuster Replacement (Service and Repair)
* Driver or Passenger Seat Lumbar Support Replacement (Driver or Passenger Seat Lumbar Support Replacement)
* Steering Column Telescope Actuator Replacement (Service and Repair)
* Tilt Motor Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for MSM replacement, setup, and programming