Fault code 1: Diagnosis/troubleshooting

DIAGNOSIS/TROUBLESHOOTING (FAULT CODE 1)

Work instruction			Display OK	If not OK
1	Check country coding	Connect PST 2 and switch on ignition. Check the country coding in the menu item "Modify coding"	The control module is correctly coded Step 2	Recode the control module -> End
2	Check micro switches of the door locks	Switch on ignition Select menu item "Input signals" Select switch positions "driver's side secured" and "pasenger's side secured"	Driver's side not secured Passenger's side not secured -> End	Step 3
3	Check wiring from alarm system control module to door lock for short circuit to ground	Switch off ignition Pull plug A off the control module Depending on the test result from step 2, pull plug off the driver's and/or passenger's door lock Measure resistance between plug A on control module pin 5 and ground Measure the resistance between plug A pin 28 and ground	Step 4	Repair wiring harness -> End
4	Check wiring from alarm system control module to door lock for short circuit to B+	Switch on ignition Measure voltage between plug A on control module pin 5 and ground Measure voltage between plug A on control module pin 28 and ground	0 V Step 5	Repair wiring harness -> End
5	Check wiring from control module to door lock for open circuit	Switch off ignition Measure resistance between plug A on control module pin 5 and pin 7 of plug on left door lock Measure resistance between plug A on control module pin 28 and pin 7 of plug on right door lock	< 5 Step 6	Repair wiring harness -> End
6	Check the wire from the central locking switch to the control module for open circuit	Pull plug off central locking switch Measure resistance between plug on central locking switch pin A1 and pin 29 of control module plug A	< 5 Step 7	Repair wiring harness -> End
7	Depending on the test result of step 2, replace the driver's/passenger's door lock		-> End