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

Multi-Function Transmission Range (TR) Switch, Checking

Recommended special tools and equipment
- V.A.G 1526 multimeter or V.A.G 1715 multimeter
- V.A.G 1594 connector test kit
- Wiring diagram

Test requirements
- Respective fuses must be OK:
- Control Module with indicator unit in instrument panel insert -J285- must be OK.
- Battery voltage must be at least 11.5 volts.
- All electrical consumers such as, for example, lights and rear window defroster must be switched off.
- Parking brake must be engaged.
- Selector lever must be in -P- position.
- Ground (GND) connections to transmission must be OK.
- Ignition switched off.

Function test
- Switch ignition on.
- Depress brake pedal and maintain depressed.
- Shift into all selector lever positions.
- Selector lever position must correspond to display of Control Module with indicator unit in instrument panel insert -J285-
- Switch ignition off.

If selector lever position does not match with display:







- Disconnect harness connector -2- to Multi-Function Transmission Range (TR) Switch -F125- (-1-).
Observe safety precautions.
- Check harness connector for contact corrosion and ingress of water.

If harness connector is not OK:
- Repair malfunction and repeat test sequence.
- Erase DTC memory of Transmission Control Module (TCM). Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

If harness connector is OK:
- Check wires to Transmission Control Module (TCM) according to wiring diagram.

Checking wires to Transmission Control Module (TCM)
- Connect test box to Transmission Control Module (TCM) wiring harness. connect test box for wiring test.

Vehicles with engine code AEB
- Check wires between test box and 8-pin connector to Transmission Control Module (TCM) for open circuit according to wiring diagram.
Terminal 2 + socket 36
Terminal 3 + socket 8
Terminal 4 + socket 37
Terminal 5 + socket 9
Wire resistance: max. 1.5 ohms

Vehicles with engine code ATW, AUG
- Check wires between test box and 8-pin connector to Transmission Control Module (TCM) for open circuit according to wiring diagram.
Terminal 2 + socket 36
Terminal 3 + socket 8
Terminal 4 + socket 37
Terminal 5 + socket 9
Terminal 6 + sockets 6, 28, 34
Wire resistance: max. 1.5 ohms

Vehicles with engine code AWM
- Check wires between test box and 10-pin connector to Transmission Control Module (TCM) for open circuit according to wiring diagram.
Terminal 1 + socket 55
Terminal 2 + socket 36
Terminal 3 + socket 8
Terminal 4 + socket 37
Terminal 5 + socket 9
Terminal 10 + socket 34
Wire resistance: max. 1.5 ohms

Continuation for all vehicles
- Also check wires for short circuit to each other.
Specified value: Infinite ohms

If no malfunctions are found in wires:
- Replace Multi-Function Transmission Range (TR) Switch -F125-.
- Erase DTC memory of Transmission Control Module (TCM). Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes