Multi-Function Transmission Range (TR) Switch F125, Checking

Multi-Function Transmission Range (TR) Switch F125, checking

Special tools, testers and auxiliary items required
- Multimeter
- Wiring diagram

Requirements
- Fuse S15 OK.
- The Control Module with indicator unit in the Instrument Cluster Control Module J285 must be OK.
- The selector lever cable adjustment OK.
- The battery voltage must be at least 12.5 Volts.
- All electrical consumers must be switched off.
- The parking brake must be engaged.
- The selector lever must be in the "P" position.
- The Ground (GND) connections to transmission must be OK.

Test procedure
- Perform a preliminary check to verify the customers complaint. Service and Repair

Start diagnosis
- Switch the ignition on.
- Depress the brake pedal and maintain depressed.
- Shift the selector lever into all positions.

The selector lever position must correspond to the display of the Control Module with the indicator unit in the Instrument Cluster Control Module J285.

- Switch the ignition off.

If the selector lever position does not correspond to the display of the Control Module with indicator unit in the Instrument Cluster Control Module J285:






- Disconnect the Multi-Function Transmission Range (TR) Switch F125 electrical harness connector.
- Check the electrical harness connector for damage, corrosion, lose or broken terminals.
- Repair any damage found to the electrical harness connector.

If the electrical harness connector is not OK:
- Repair the malfunction.

If the electrical harness connector is OK:

Checking voltage
- Switch the ignition on.
- Using a multimeter, check the Multi-Function Transmission Range (TR) Switch F125 electrical harness connector T8 terminal 7 to Ground (GND) for voltage.
- Switch the ignition off.
Specified value, Battery voltage.

If the specified value was not obtained:
- Check the wiring from the Multi-Function Transmission Range (TR) Switch F125 electrical harness connector terminal 7 to the plus connection 15 for an open circuit, short to ground (GND) or a short to Battery (+).

- If necessary, repair the faulty wiring connection.

If the specified value was obtained:

Checking wiring
If the manufacturers test box is being used. Perform the following step.
- Install the test box Test Box 105 Pin VAG1598/31. Refer to Fuel Injection Ignition, Repair Group 24.
If the manufacturers test box is not being used. Perform the following step.
- Remove the Transmission Control Module (TCM) J217.






- Using a multimeter, check the Multi-Function Transmission Range (TR) Switch F125 electrical harness connector terminals to the Transmission Control Module (TCM) J217 electrical harness connector T68 terminals for an open circuit.






Specified value: 1.5 Ohms Max.

If the specification was not obtained:

- Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
- If necessary, repair the faulty wiring connection.

If no malfunction was found in the wiring and the resistance was not OK:
- Check the Multi-Function Transmission Range (TR) Switch F125.
- Erase the DTC memory. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Perform a road test to verify repair.

If the DTC does not return:
Repair complete, Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
- End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK:
- Replace the Transmission Control Module (TCM) J217.
- Assembly is performed in the reverse of the removal.

Final procedures
1. Check the DTC memory.
2. If necessary, erase DTC memory of the Transmission Control Module (TCM) J217.
3. If the DTC memory was erased, generate readiness code.

End diagnosis