B1D91

B1D91-STEERING COLUMN TILT POSITION SENSOR CIRCUIT LOW





For a complete wiring diagram consult Diagrams/Electrical.

Theory of Operation


The MSM input signal from the Steering Column Tilt Sensor is recognized in a specified voltage area. The input channel is an analog to digital converter input and the sensor is a hall sensor.


- When Monitored:
The hall supply voltage is switched on when the motor becomes activated.

- Set Condition:
The sensed input is less than 1.7 volts (at the controller input, not at the module input) for more than 14 mS








Diagnostic Test


1. DTC IS ACTIVE
Ignition on, engine not running.
With the Scan Tool, select Clear Stored DTCs in the Memory Seat Module.
Move the Steering Column Tilt Switch to the Up and Down positions several times, holding the switch in position for at least 2 seconds each time.
With the Scan Tool, select View DTCs in the Memory Seat Module.
Does the DTC reset and/or remain active?

Yes


- Go to 2


No


- Go to 6




2. CHECK DTC WITH HARNESS DISCONNECTED
Turn the ignition off.
Disconnect the Steering Column Tilt Motor connector.
Turn the ignition on.
Move the Steering Column Tilt Switch to the Up and Down positions several times.
With the Scan Tool, select Clear Stored DTCs in the Memory Seat Module.
Move the Steering Column Tilt Switch to the Up and Down positions several times, holding the switch in position for at least 2 seconds each time.
With the Scan Tool, select View DTCs in the Memory Seat Module.
Does the DTC reset and/or remain active?

Yes


- Go to 4


No


- Go to 3




3. STEERING COLUMN TILT MOTOR
View repair.


Repair


- Inspect the wiring between the Steering Column Tilt Motor and the harness connector (on the motor side) for a short to ground or to any other circuit. If any problems are found, repair as necessary. If no problems are found, replace the Steering Column Tilt Motor.




4. (P151) TILT STEERING UP/DOWN POSITION SENSE CIRCUIT SHORT TO GROUND




Turn the ignition off.
Disconnect the Memory Seat Module (MSM) C1 connector.
Measure the resistance between ground and the (P151) Tilt Steering Up/Down Position Sense circuit at the Steering Column Tilt Motor connector (harness side).
Is the resistance below 5.0 ohms?

Yes


- Repair the (P151) Tilt Steering Up/Down Position Sense circuit for a short to ground.


No


- Go to 5




5. MEMORY SEAT MODULE (MSM)
Inspect the wiring between the Memory Seat Module harness connector and the Steering Column Tilt Motor harness connector for a short to ground or to any other circuit. If any problems are found, repair as necessary. If no problems are found, view repair.


Repair


- Replace the Memory Seat Module (MSM).




6. INTERMITTENT STEERING COLUMN TILT POSITION SENSOR CIRCUIT LOW DTC
The conditions necessary to set this DTC are not present at this time.
While monitoring the scan tool data relative to this circuit, wiggle test the component and connectors and move the switch to each position.
Look for the data to change other than as expected or for the DTC to reset during the wiggle test.
Were any problems found?

Yes


- Repair as necessary.


No


- Test complete.