Faulty Signal
Faulty signal
Erasing diagnostic trouble codes (DTCs)
- Ignition on.
Erase diagnostic trouble codes (DTCs).
Select continue when the diagnostic trouble codes (DTCs) have been erased.
Continue - Reading off diagnostic trouble codes (DTCs)
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Reading off diagnostic trouble codes (DTCs)
- Remove the key from the 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 the control module Replacing the 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 diagnostic trouble codes (DTCs).
Select continue when the diagnostic trouble codes (DTCs) have been erased.
Continue - Reading off diagnostic trouble codes (DTCs)
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Reading off diagnostic trouble codes (DTCs)
- Remove the key from the 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 the 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 an open-circuit 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 the 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 the 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.
- For further information about signals and other values, see Signal specification, lock and alarm (VGLA) Signal Specification, Lock and Alarm (VGLA).
- To connect the breakout box, see Connecting the breakout box, lock and alarm (VGLA) Connecting the Breakout Box.
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 diagnostic trouble codes (DTCs).
Select continue when the diagnostic trouble codes (DTCs) have been erased.
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 the key from the 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
No - FAULT FOUND
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Fault-tracing information
Information
Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.
Do you want to exit fault-tracing?
Yes - Exit fault-tracing
No - Attempt New Test
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FAULT-TRACING FAILED - No Fault Found
Attempt New Test - Erasing diagnostic trouble codes (DTCs)
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Intermittent fault
Check the 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 the cable between siren #6 and the 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
No Fault Found
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Fault-tracing information
Information
Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).
Do you want to view the information again?
Yes - Attempt New Test
No - FAULT FOUND
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Attempt New Test - Erasing diagnostic trouble codes (DTCs)
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