Fault Code 1134
Fault code 1134Alarm system (alarm siren and horn)
NOTE: This fault was detected by the 'rear convenience system' control module.
Diagnostic conditions
- Ignition on
- Battery voltage OK (11.4 to 14.5 V)
- Internal rear convenience system control module function test
- Activate alarm system
Possible causes of fault
Alarm system (alarm siren)
- No signal/communication on signal lead
- Alarm system siren faulty
- No voltage supply to alarm siren
Alarm system (horn)
- No voltage supply to alarm siren
- Wiring faulty
Affected pins
Alarm system (alarm siren)
Rear convenience system control module, plug A:
- Pin 2 'TWS (theft-warning system) alarm siren'
Alarm system (horn)
Rear convenience system control module, plug B:
- Pin 12 'TWS horn'
Diagnosis/troubleshooting
NOTE:
Visual inspection: In the next troubleshooting section, please check first that the affected pins on the rear convenience system control unit plug connection are neither damaged nor corroded. The wiring and plugs of the affected components must also be checked for external damage and correct contacts. Repair damaged or corroded pins if possible, otherwise replace affected pins. Repair or replace damaged wires.
NOTE:
Sporadic faults: In the event of faults that occur sporadically, the wiring positions that are linked to moving parts on and in the vehicle must be checked for each system. Various statuses that can cause faults must be simulated with the help of the wiring diagram.
NOTE:
Battery voltage: A battery voltage of between 11.4 and 14.5 V is required for the following troubleshooting procedure. This must be checked and provided, if necessary. On the vehicle electrical system, the voltage to the fuse (input side) must be guaranteed.
NOTE: The alarm system siren has an internal power supply. If the plug is pulled off the alarm siren with the alarm system in the armed condition, an alarm will be triggered.
Troubleshooting alarm siren
Troubleshooting horn
