Multi-Function Transmission Range (TR) Switch, Checking

Multi-Function Transmission Range (TR) Switch -F125-, 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.
- Selector lever must be in -P- position.
- Ground (GND) connections to transmission must be OK.
- All electrical consumers such as, lights and rear window defroster must be switched off.
- Parking brake must be engaged or else daylight driving lights will be switched on.
- 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. Test Box, Connecting For Wiring Test

Vehicles with transmission codes DRN, DRD (hydraulic control "E17")
- 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 + socket 34
Wire resistance: max. 1.5 ohms

Vehicles with transmission codes EKC, EKD (hydraulic control "E18/2")
- 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