Test Point 21

TEST POINT 21
W lead (DmE Immobilizer) Open Circuit

Fault Code 21

Fault Effect: No engine start possible

Procedure

1. Pull plug I off the alarm system control module.

2. Unplug the DmE (ECm) connector.

3. Ohmmeter at alarm system control module plug I, pin 23 and ECm connector pin 88 or, as from model year '00, plug I, pin 3.

Display: < 5 ohms

Note:
The wire is routed via the plug connection X 3/1, pin 14 (up to and including model year '99, direct wire as from model year '00).

4. Ohmmeter at alarm system control module plug I, pin 23 and ground

Display: infinity

5. Voltmeter at alarm system control module plug I pin, 23 and ground. Switch ignition on.

Display: 0 Volts

If no fault can be detected, either the DmE control module or the alarm system control module is faulty.