Fault code 7: Diagnosis/troubleshooting

DIAGNOSIS/TROUBLESHOOTING (FAULT CODE 7)

Work instruction			Display OK	If not OK
1	Check central locking switch	Switch off ignition Pull plug A off the control module Pull plug off central locking switch Switch on ignition Measure voltage between plug A on alarm system control module pin 29 and ground	0 V Step 2	Repair wiring harness -> End
2	Check central locking switch	Measure resistance between pins 1 and 2 of plug for central locking switch	approx. 180 at 20 °C Step 3	Replace resistor or repair wiring harness -> End
3	Check operating points of central locking switch	Measure resistance between pins 3 and A1 on central locking switch Measure resistance between pins 4 and 2 on central locking switch	Central locking switch not actuated in "open" direction Central locking switch actuated in "open" direction < 5 Step 4	Step 5 -> End
4	Check operating points of central locking switch	Measure resistance between pins 4 and 1 on central locking switch	Central locking switch not actuated in "close" direction Central locking switch actuated in "close" direction < 5 Step 6	Step 5 -> End
5	Replace central locking switch		-> End
6	Replace control module		-> End