Test Point 21

Test point 21
W-lead (DME - immobilizer)
Open circuit

Fault code 21
1. Pull off plug I on the alarm control module.
2. Pull off the DME (ECM) plug.
3. Ohmmeter at plug I, alarm control module pin 23, and DME plug pin 88.
Display: < 5 Ohms

NOTE: The lead is routed via plug connection X 3/1 pin 14.

4. Ohmmeter on alarm control module plug I pin 23 and ground.
Display: Infinity Ohms

5. Voltmeter at plug I alarm control module pin 23 and ground.
Switch on ignition.
Display: 0 Volt

If no fault can be detected, try replacing the alarm control module. If the fault is still present afterward, the DME control module is faulty.