Test Point 21

TEST POINT 21
W-line (DmE Immobilizer) Interruption

Fault Code 21

Fault Effect: No engine start possible

Procedure

1. Pull off plug I on the alarm control unit.

2. Pull off the DmE plug.

3. Ohmmeter at plug I, alarm control unit pin 23, and DmE plug pin 88.

Display: < 5 ohms

Note:
The line runs via plug connection X 3/1, pin 14.

4. Ohmmeter at plug I alarm control unit pin 23 and ground.

Display:

5. Voltmeter at plug I alarm control unit pin 23 and ground. Switch on the ignition.

Display: 0 Volts

If no fault can be detected, try replacing the alarm control unit. If the fault is still present, the DmE control unit is faulty.