Fault code 21: Diagnosis/troubleshooting

DIAGNOSIS/TROUBLESHOOTING (FAULT CODE 21)

Work instruction			Display OK	If not OK
1	Check wire from the alarm system control module to the DME control module for short to ground.	Switch off ignition Pull plug A off the alarm system control module Pull plug A off the DME control module Measure resistance between plug A on alarm system control module pin 23 and ground	Step 2	Repair wiring harness -> End
2	Check wire from the alarm system control module to the DME control module for open circuit	Measure resistance between plug A on alarm system control module pin 23 and plug A on DME control module pin 3	< 5 Step 3	Repair wiring harness -> End
3	Replace DME control module as a test		-> End