3. Ohmmeter on alarm control module plug I pin 18 and ground.
Display: Infinity Ohms
If display < 5 Ohms, check wiring harness for pinches and chafing damage.
Test Point 19
Test point 19
Status lead, signal converter
Short to B+
Fault code 19
1. Pull off plug I on the alarm control module.
2. Pull off the plug on the signal converter for the transponder.
3. Voltmeter at plug I alarm control module pin 12 and ground.
Switch on ignition.
Display: 0 Volt
If battery voltage is displayed, check wiring harness for pinches and chafing damage.
Test Point 20
Test point 20
Status lead, signal converter
Short to ground
Fault code 20
1. Pull off plug I on the alarm control module.
2. Pull off the plug on the signal converter for the transponder.
3. Ohmmeter on alarm control module plug I pin 12 and ground.
Display: Infinity Ohms
If display < 5 Ohms, check wiring harness for pinches and chafing damage.
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.
Test Point 22
Test point 22
Passenger compartment monitoring sensor
Short to ground
Fault code 22
1. Pull off plug I on the alarm control module.