Faulty Signal
Faulty signal
Erasing diagnostic trouble codes (DTCs)
- Ignition on.
- Erase DTCs.
Continue - Reading off diagnostic trouble codes (DTCs)
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Reading off diagnostic trouble codes (DTCs).
- Remove key from ignition switch
- Ensure that all doors, the hood and trunk lid are shut.
- Lock the car with the remote control.
- Wait approximately 10 seconds.
- Unlock the car with the remote control.
- Ignition on.
- Read off diagnostic trouble codes (DTCs).
Does diagnostic trouble code (DTC) GLA-311 recur?
Yes - Checking connectors
No - Intermittent fault
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Checking connectors
- Ignition off.
- Disconnect siren according to Replacing the siren Replacing the Siren.
- Expose VGLA control module according to Replacing main control module Replacing Main Control Module.
Check siren and VGLA control module connectors for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Ignition on.
- Erase DTCs.
Continue - Reading off diagnostic trouble codes (DTCs)
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Reading off diagnostic trouble codes (DTCs).
- Remove key from ignition switch
- Ensure that all doors, the hood and trunk lid are shut.
- Lock the car with the remote control.
- Wait approximately 10 seconds.
- Unlock the car with the remote control.
- Ignition on.
- Read off diagnostic trouble codes (DTCs).
Does diagnostic trouble code (DTC) GLA-311 recur?
Yes - Checking cables
No - FAULT FOUND
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Checking cables
- Ignition off.
- Disconnect siren connector
Check fuse 6.
Check cable between control module #A22 and siren #3 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and for open-circuits according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Also check whether the cable is too close to a source of interference. Check cable between fuse 6 and siren #4 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault Check cable between siren #6 and ground for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault
Other information:
- The voltage between siren connector #4 and ground should be battery voltage.
Remedy as necessary.
Was a fault detected?
Yes - Erasing diagnostic trouble codes (DTCs)
No - Replacing component
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Replacing component
Try a new siren according to Replacing the siren Replacing the Siren.
Continue - Erasing diagnostic trouble codes (DTCs)
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Erasing diagnostic trouble codes (DTCs)
- Ignition on.
- Erase DTCs.
Continue - Verification
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Verification
Hint: After carrying out the repair, check that the fault has been remedied as follows.
that the fault is corrected as follows:
- Reinstall connectors, components etc.
- Remove key from ignition switch
- Ensure that all doors, the hood and trunk lid are shut.
- Lock the car with the remote control.
- Wait approximately 10 seconds.
- Unlock the car with the remote control.
- Ignition on.
- Read off diagnostic trouble codes (DTCs).
Does diagnostic trouble code (DTC) GLA-311 recur?
Yes - Fault-tracing information
No - FAULT FOUND
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Fault-tracing information
Verification indicates that the fault persists.
Do you want to repeat fault-tracing?
Yes - Erasing diagnostic trouble codes (DTCs)
No - No Fault Found
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Intermittent fault
Check cable between passenger compartment fuse 6 and siren #4 for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults. Check cable between siren #6 and battery ground terminal for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Continue - Fault-tracing information
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Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
Do you want to repeat fault-tracing?
Yes - Erasing diagnostic trouble codes (DTCs)
No - No Fault Found
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