B1336
DTC B1336
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptor
DTC B1336
- Device Power 3 Circuit Range
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 PWR SEATS circuit breaker located in the I/P fuse block. This voltage is used to power up the MSM and also to apply power to the seat motors when commanded On. The MSM applies battery voltage and ground to the seat motors through the motor control circuits. During memory recall and manual seat 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 seat motors in order to prevent the internal MSM circuitry from damage. The MSM is grounded through the module ground circuit at G301.
Conditions for Running the DTC
Battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
DTC B1336 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 is also referred to as the Driver Position Module 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 Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Testing
1. Ignition ON, with a scan tool clear the current and history DTC.
2. Determine which motor set the DTC by operating the seat 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
3. Ignition OFF, disconnect the X3 harness connector at the MSM.
4. Test for infinite resistance between the appropriate control circuits listed below and ground:
* Seat horizontal motor forward control terminal N
* Seat horizontal motor rearward control terminal S
* Seat front vertical motor up control terminal A
* Seat front vertical motor down control terminal M
* Seat rear vertical motor up control terminal R
* Seat rear vertical motor down control terminal P
* Seat recline motor forward control terminal F
* Seat recline motor rearward control terminal G
• If not the specified value, test the control circuit for a short to ground. If the circuit tests normal, test or replace the appropriate seat motor assembly or recline motor.
5. Connect the X3 harness connector at the MSM and disconnect the appropriate X1 harness connector at the seat motor assembly or the seat recline motor.
6. Connect a test lamp between the appropriate control circuits listed below:
* Seat horizontal motor terminal A and terminal B
* Seat front vertical motor terminal C and terminal D
* Seat rear vertical motor terminal E and terminal F
* Seat recline motor l terminal A and terminal B
7. Ignition ON, command the appropriate motor in Forward/Rearward or UP/Down directions with a scan tool. The test lamp should turn ON when commanding the motor in the froward and rearward or up and down directions.
• If the test lamp remains OFF during either of the commands, test for a short to ground or an open/high resistance on the control circuits. If the circuits test normal, replace the MSM.
8. If all circuits test normal, test or replace the appropriate seat motor assembly or recline motor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Driver Seat Adjuster Replacement (Driver Seat Adjuster Replacement)
* Control Module References (Programming and Relearning) for MSM replacement, setup, and programming