Fault code 4: Diagnosis/troubleshooting

DIAGNOSIS/TROUBLESHOOTING (FAULT CODE 4)

Work instruction			Display OK	If not OK
1	Check wire between alarm system control module and door lock (driver/passenger) for short circuit to ground	Pull plug A off the control module Pull plug off both door locks Measure the resistance between plug A pin 35 and ground	Step 2	Repair wiring harness -> End
2	Check wire between alarm system control module and door lock (driver/passenger) for short circuit to B+	Switch on ignition Measure voltage between plug A on control module pin 35 and ground	0 V Step 3	Repair wiring harness -> End
3	Check wire between alarm system control module and door lock (driver/passenger) for open circuit	Switch off ignition Measure resistance between plug A pin 35 and plug on driver's door lock pin 5 Measure resistance between plug A pin 35 and plug on passenger's door lock pin 5	< 5 Step 4	Repair wiring harness -> End
4	Determine which door lock is faulty	In the menu item "Input signals", select "Door lock barrel" Connect plug on passenger's door lock	Door lock barrel not actuated Step 5	Step 6
5	Determine which door lock is faulty	In the menu item "Input signals", select "Door lock barrel" Connect plug on driver's door lock	Door lock barrel not actuated	Step 7
6	Replace door lock on passenger's side		-> End
7	Replace door lock on driver's side		-> End