Signal Too Low. Permanent Fault
Signal too low. Permanent fault
Checking ground lead
- Ignition off.
Remove the connector from the antenna unit.
Check the cable between the antenna unit terminal #7 and ground terminal 31/83. Check for an open-circuit.
Remedy as necessary.
Other information:
- To access the immobilizer antenna unit/connector, see Antenna unit immobilizer, replacing Service and Repair
- Checking wiring and terminals Checking Wiring And Terminals.
Is the cable OK?
Yes - Checking the power supply
No - Verification
-------------------------------------------------
Checking the power supply
- Ignition on.
Check the supply voltage between antenna unit terminal #1 and ground.
Other information
- To access the immobilizer antenna unit/connector, see Antenna unit immobilizer, replacing Service and Repair.
Is the voltage OK?
Yes - Checking the signal cable
No - Checking cable for an open-circuit
-------------------------------------------------
Checking the signal cable
- Ignition off
- Disconnect the connector from the central electronic module (CEM)
- Disconnect the immobilizer antenna unit.
Check the signal cable between the central electronic module (CEM) and the immobilizer antenna unit.
Diagnostic trouble code (DTC) CEM-6C42:
The cable between the central electronic module (CEM) terminal #14D and the immobilizer antenna unit terminal #2.
Diagnostic trouble code (DTC) CEM-6C44:
The cable between the central electronic module (CEM) terminal #13D and the immobilizer antenna unit terminal #3.
Check signal cable. Check for a short-circuit to ground. Check for an open-circuit.
Remedy as necessary.
Other information:
- To access the central electronic module (CEM) connector, see Central electronic module (CEM), replacing Central Electronic Module (CEM), Replacing
- To access the immobilizer antenna unit/connector, see Antenna unit immobilizer, replacing Service and Repair
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- For information about signals, see Signal specification Pinout Values and Diagnostic Parameters
- Checking wiring and terminals Checking Wiring And Terminals.
Is the signal cable OK?
Yes - Replacing the component
No - Verification
-------------------------------------------------
Replacing the component
Replace the central electronic module (CEM).
The immobilizer function is included in the central electronic module (CEM) but cannot be replaced separately.
Other information
- To replace the central electronic module (CEM), see Central electronic module (CEM), replacing Central Electronic Module (CEM), Replacing.
Continue - Verification
-------------------------------------------------
Checking cable for an open-circuit
- Ignition off.
Check the cable between the ignition switch #15A and antenna unit terminal #1. Check for an open-circuit.
Other information:
- Checking wiring and terminals Checking Wiring And Terminals.
Continue - Verification
-------------------------------------------------
Verification
Verification
Verification
Hint: After the repair it is necessary to check that the fault has been rectified.
- Ignition off.
- Connect connectors, install components, etc.
- Start the engine.
Check that diagnostic trouble code status changes from permanent to intermittent.
Is the diagnostic trouble code status intermittent?
Yes - VERIFIED
No - VERIFICATION FAILED
------------------------
VERIFIED - Fault Found
VERIFICATION FAILED - Fault-tracing information
-------------------------------------------------
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 - FAULT-TRACING FAILED
No - Attempt New Test
------------------------
FAULT-TRACING FAILED - No Fault Found
Attempt New Test - Checking ground lead
-------------------------------------------------