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Fault code 7: Diagnosis/troubleshooting

DIAGNOSIS/TROUBLESHOOTING (FAULT CODE 7)

Work instruction Display OK If not OK
1 Check central locking switch.
  • Switch off the 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 to open.
Central locking switch actuated to Open.
< 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 to "closed".
Central locking switch actuated to closed.
< 5
Step 6		 Step 5
-> End
5
  • Replace central locking switch.
 ->End
6
  • Replace control module.
 -> End
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