B1340
DTC B1340
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 Descriptors
DTC B1340 0B
-
Device Power 4 Circuit Current Above Threshold
DTC B1340 42
-
Device Power 4 Circuit Calibration Data Set Not Programmed
DTC B1340 4B
-
Device Power 4 Circuit Calibration Not Learned
Diagnostic Fault Information
Circuit/System Description
The memory seat module (MSM) monitors the current supplied to both steering column motors. The MSM can detect both absolute and differential current levels from the these 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 steering column motors must be active.
Conditions for Setting the DTC
B1340 0B
The absolute current has exceeded the maximum value allowed.
B1340 42
This DTC will set if the module calibration is not programmed.
B1340 4B
This DTC will set if the module calibration is not learned.
Action Taken When the DTC Sets
All movement related to the steering column motors are 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 power mode changes to OFF then back to ACC or RUN.
* The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.
Diagnostic Aids
The scan tool may reference the Memory Seat Module (MSM) as the Driver Position Module.
Reference Information
Schematic Reference
* Driver Seat Schematics Driver Seat Schematics
* Tilt/Telescoping Steering Column Schematics Tilt/Telescoping Steering Column Schematics
Connector End View Reference
Component Connector End Views A/C Compressor Clutch
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 Control Module References for scan tool information
Circuit/System Testing
B1340 0B
1. Ignition ON, use a scan tool to clear the current and history diagnostic trouble code.
2. Determine which motor set this DTC by operating the motors listed below one at a time in both directions. Check for the DTC to set between each motor test.
* Steering Column Tilt motor
* Steering Column Telescope motor
3. Clear the diagnostic trouble codes.
4. Ignition OFF, disconnect the harness connector at the appropriate steering column motor for which the DTC set.
5. Ignition ON, operate the motor adjuster switch in both directions. DTC B1340 0B should not set.
• If the DTC sets, test for a short between the appropriate motor control circuits listed below. If the circuits test normal, replace the MSM.
* Steering column telescope motor terminal C and terminal D
* Steering column tilt motor terminal A and terminal B
6. Test the appropriate control circuits listed below for a high resistance. If the circuits test normal, test or replace the steering column.
* Steering column telescope motor terminal C and terminal D
* Steering column tilt motor terminal A and terminal B
B1340 42 or B1340 4B
If either DTC is set, replace the MSM.
Component Testing
Seat Motor
1. Ignition OFF, disconnect the harness connector at the appropriate seat motor.
Note:
When performing the following tests, make sure that the seat is not already in the position the test is attempting to produce.
2. Install a 30 A fused jumper wire between the control terminal 1 and 12 V. Momentarily install a jumper wire between the control terminal 5 and ground. The seat motor should momentarily perform the appropriate FORWARD/REARWARD/UP/DOWN function.
• If the function does not perform as specified, replace the seat motor.
3. Reverse the polarity of jumper wires. The a seat motor should perform in the opposite direction.
• If the function does not perform as specified, replace the seat motor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Steering Column Replacement Steering Column Replacement
* Control Module References Control Module References for MSM replacement, programming and setup