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 B1340 0B: Device Power 4 Circuit Current Above ThresholdDTC 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 | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
Steering Column Telescope Motor Forward Control | B3921 02 | B1340 0B | 1 | B3921 01 | B1340 42, B1340 4B, B2860 5A |
Steering Column Telescope Motor Rearward Control | B3921 02 | B1340 0B | 1 | B3921 01 | B1340 42, B1340 4B, B2860 5A |
Steering Column Tilt Motor Down Control | B3921 02 | B1340 0B | 2 | B3921 01 | B1340 42, B1340 4B, B2880 5A |
Steering Column Tilt Motor Up Control | B3921 02 | B1340 0B | 2 | B3921 01 | B1340 42, B1340 4B, B2880 5A |
1. Steering column does not telescope In/Out 2. Steering column does not tilt Up/Down | |||||
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
Connector End View Reference
Description and Operation
Memory Seats Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
B1340 0B
- Ignition ON, use a scan tool to clear the current and history diagnostic trouble code.
- 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.
- Clear the diagnostic trouble codes.
- Ignition OFF, disconnect the harness connector at the appropriate steering column motor for which the DTC set.
- Ignition ON, operate the motor adjuster switch in both directions. DTC B1340 0B should not set.
- Test the appropriate control circuits listed below for a high resistance. If the circuits test normal, test or replace the steering column.
| • | Steering Column Tilt motor |
| • | Steering Column Telescope motor |
| ⇒ | 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 |
| • | 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
- Ignition OFF, disconnect the harness connector at the appropriate seat motor.
- Install a 30 A fused jumper wire between the control terminal 1 and 12 volts. 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.
- Reverse the polarity of jumper wires. The a seat motor should perform in the opposite direction.
Important: When performing the following tests, make sure that the seat is not already in the position the test is attempting to produce.
| ⇒ | If the function does not perform as specified, replace the seat motor. |
| ⇒ | If the function does not perform as specified, replace the seat motor. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for MSM replacement, programming and setup |
