Tiptronic Switch, Checking

Tiptronic Switch, Checking

Special tools, testers and auxiliary items required

• Multimeter

• Wiring diagram

Requirements

• Fuse (S231) 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. Refer to => [ Preliminary Check ] Preliminary Check

Start diagnosis

Procedure

- Switch the ignition on.

- Depress the brake pedal and maintain depressed.

- Shift the selector lever into all positions.

The selector lever position must correspond with the Tiptronic Switch (F189) indicator display unit.

- Switch the ignition off.

If the selector lever position does not correspond with the Tiptronic Switch (F189) indicator display unit:

- Disconnect the Tiptronic Switch (F189) electrical harness connector - 1 -.





- Check the electrical harness connector for damage, corrosion, loose 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 Tiptronic Switch (F189) electrical harness connector terminal T10/8 to Ground (GND) for voltage.

Specified value, Battery voltage.

- Switch the ignition off.

If the specified value was not obtained:

- If necessary, repair the faulty wiring connection.

If the specified value was obtained:

Checking Ground (GND)

- Using a multimeter, check the Tiptronic Switch (F189) electrical harness connector terminal 10/31 to Ground (GND) connection for resistance.

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 OK:

Checking wiring

If the manufacturers test box is being used, perform the following step.

Install the test box.

If the manufacturers test box is not being used, perform the following step.

- Remove the Transmission Control Module (TCM) (J217). Refer to => [ Transmission Control Module, Replacing ] Service and Repair.

- Using a multimeter, check the Tiptronic Switch (F189) electrical harness connector terminals to the Transmission Control Module (TCM) (J217) electrical harness connector 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:

- Replace the Tiptronic Switch (F189).

If no malfunction is found in the wiring and the resistance was OK:

- Replace the Transmission Control Module (TCM) (J217). Refer to => [ Transmission Control Module, Replacing ] Service and Repair.

Final procedures

1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Mode 03 - Read DTC Memory.

2. If necessary, erase DTC memory of the Transmission Control Module (TCM) (J217). => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Mode 04 - Erase DTC Memory.

3. Generate readiness code. => [ Readiness Code ] Readiness Code.