Checking The Demisting For The Rear Windshield And Door Mirrors
Checking the demisting for the rear windshield / door mirrors
Connecting the breakout box
Connecting the breakout box
981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 981 3194 Replaced by 9511495 981 3194 Replaced by 951 1495
Breakout box and checking ground terminals
Is the breakout box connected? Have the ground terminals been checked?
Yes - DONE
No - Areas of use for the breakout box
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Areas of use for the breakout box
Breakout box 981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 is designed to facilitate reading off:
- the control module input and output signals when the control module is connected
- the resistance of cables and components when the control module is disconnected
The breakout box makes it safer to take readings because it is easier to see and access measurement points. The risk of accidental short-circuits and damaged connector pins is also reduced.
Switch off the power to the ECC control module when connecting the breakout box otherwise the control module may be damaged and incorrect diagnostic trouble codes (DTCs) stored.
Continue - Connecting the breakout box
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Connecting the breakout box
Select one of the above options to continue.
1 - Connecting the breakout box between the control module and the wiring
2 - Connecting the breakout box to the wiring only
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Connecting the breakout box between the control module and the wiring
- Ignition off.
- ECC control module connected.
Check the control module and the control module connector visually according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault
Connect adapter 981 3194 Replaced by 9511495 981 3194 Replaced by 951 1495 (only the 30-pin connector) between the ECC control module and the climate control connector. Then connect breakout box 981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 to the adapter. This is connection is carried out when taking readings with the control module connected.
Control module connector terminals #1- #30 correspond to terminals #1-#30 on the breakout box.
Continue - Checking ground terminals
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Connecting the breakout box to the wiring only
- Ignition off.
- Disconnect the ECC control module.
Check the control module and the control module connector visually according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault
Connect adapter 981 3194 Replaced by 9511495 981 3194 Replaced by 951 1495 (only the 30-pin connector) to the climate control system connector. Then connect breakout box 981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 to the adapter. The breakout box is now only connected to the climate control connector. This connection is used to measure resistance in the ECC system cables and components with the ECC control module disconnected.
Control module connector terminals #1- #30 correspond to terminals #1-#30 on the breakout box.
Continue - Checking ground terminals
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Checking ground terminals
- Ignition off.
Connect an ohmmeter between the chassis and terminal #3 to check the power ground.
The ohmmeter should read 0ohms.
OK - Checking ground terminals
Not OK - Checking for an open-circuit
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Checking ground terminals
Connect an ohmmeter between terminals #3 and #23 on the breakout box.
The ohmmeter should read approximately 0 ohms.
OK - No Fault Found
Not OK - Checking the breakout box
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Checking the breakout box
- Ignition off.
- Disconnect the adapter from the ECC control module and from the ECC control module connector.
Check the internal cables in the breakout box for the ground terminal which deviated from 0 ohms.
Connect an ohmmeter between:
- breakout box terminal #3 and adapter connector terminal #3
- breakout box terminal #23 and adapter connector terminal 23
The ohmmeter should read 0 ohms.
OK - Replacing the component
Not OK - Replacing the component
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Replacing the component
- Try a new ECC control module.
Continue - Verification
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Checking for an open-circuit
Check the ground lead between the 30 pin connector terminal #3 (ECC control module side) and ground terminal relay box 15/14, ground rail D8, for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault
Is there an open-circuit in the cable?
Yes - Remedying an open-circuit
No - Checking for an open-circuit
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Checking for an open-circuit
Check for an open-circuit between ground rail D10 and the chassis according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Continue - Verification
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Remedying an open-circuit
- Remedy the open-circuit.
Continue - Verification
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Replacing the component
- Disconnect adapter 981 3194 Replaced by 9511495 981 3194 Replaced by 951 1495 from the breakout box 981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428. Check the relevant leads in the breakout box and adapter to establish where the fault is.
Replace the breakout box or the adapter.
Continue - Checking ground terminals
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Self-adjustment of the shutter motor end position
Activate the self-adjustment function with VIDA according to Self adjustment of damper motor limit positions Self Adjustment Of Damper Motor Limit Positions.
Continue - Verification
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Verification
Verification
Hint: Check after repair that the fault has been rectified.
- Ignition off
- Reconnect connectors, reinstall components etc.
- ECC- control module connected.
- Engine running
- VCT2000 connected to the data link connector (DLC).
Establish communication with the ECC -system.
Continue - Verification, continued
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Verification, continued
- For further information about self-adjustment, see Self adjustment of damper motor limit positions Self Adjustment Of Damper Motor Limit Positions.
Click the VCT2000 symbol to activate the self adjustment function.
Continue - Verification, continued
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Verification, continued
Click on the VCT2000 symbol to read off the diagnostic trouble codes (DTCs).
Continue - Verification, continued
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Verification, continued
Erase diagnostic trouble codes (DTCs).
Continue - Verification, continued
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Verification, continued
Check that diagnostic trouble codes (DTCs) do not recur.
Do the diagnostic trouble codes (DTCs) recur?
Yes - VERIFICATION FAILED
No - VERIFIED
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VERIFICATION FAILED - Fault-tracing information
VERIFIED - FAULT FOUND
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Fault-tracing information
Information
Fault-tracing information
The fault should be diagnosed and remedied. Since this is not the case the fault-tracing process has failed.
Complete the fault-tracing for those fault or try again.
Do you want to terminate fault-tracing at this time?
Yes - Exit fault-tracing
No - Attempt New Test
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Attempt New Test - Connecting the breakout box
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- Ignition off.
- Connectors connected.
- ECC control module connected.
Connect the breakout box between the ECC control module and the wiring.
FAULT FOUND - Checking voltage
FAULT-TRACING FAILED - Checking voltage
No Fault Found - Checking voltage
DONE - Checking voltage
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Checking voltage
- Ignition off.
Connect a voltmeter between terminals 3 and 24 on the breakout box.
- Ignition on.
- The voltmeter should read approximately 0.8 V when the button for demisting (rear windshield / door mirrors) is in the ON position (the orange LED is lit).
- The voltage must be approximately battery voltage when the button for demisting (rear windshield / door mirrors) is in the OFF position (the orange LED is not lit).
Is the voltage OK in both cases?
Yes - Checking fuses
No - Checking fuses
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Checking fuses
- Ignition off.
Check fuse 3 (25 A) in the engine compartment integrated relay / fusebox.
Is the fuse intact?
Yes - Checking the voltage for the electrical heating
No - Checking for a short-circuit
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Checking fuses
- Ignition off.
Check fuse 12 (15 A) in the integrated relay / fusebox in the passenger compartment.
Is the fuse intact?
Yes - Checking for an open-circuit
No - Checking for a short-circuit
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Checking the voltage for the electrical heating
- Ignition off.
- Disconnect the connector for demisting.
Connect a voltmeter between ground (0 V) and the demisting connector.
- Ignition on.
- The voltmeter should read approximately battery voltage when the button for demisting (rear windshield / door mirrors) is in the ON position (the orange LED is lit).
Is the voltage OK?
Yes - Replacing the component
No - Checking for an open-circuit
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Checking for a short-circuit
- Ignition off.
- Disconnect the relay for demisting.
Check the following cables for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault :
- the cable between fuse 3 (25 A, negative side) and relay demister (1) terminal 2 on the relay base socket.
- the cable between demister relay (1) (base socket terminal 1 and the demister.
Is there a short-circuit to ground in any of the cables?
Yes - Verification
No - Replacing the component
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Replacing the component
- Check fuse 3 (25 A) in the engine compartment integrated relay / fusebox.
Continue - Verification
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Replacing the component
- Replace the demister in the rear windshield according to Repairing heating elements in the rear windshield Service and Repair or Replacing the rear windshield Replacing The Rear Windshield. Replace the demister in the door mirrors according to Door mirror Door Mirrors.
Continue - Verification
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Checking for an open-circuit
- Ignition off.
- Disconnect the relay for demisting.
Check the following cables for an open-circuit according to according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault :
- the cable between fuse 3 (25 A, negative side) and relay demister (1) (terminal 2 on the relay base socket).
- the cable between demister relay (1) (base socket terminal 1 and the demister.
Is there an open-circuit in any of the cables?
Yes - Verification
No - Replacing the component
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Checking for an open-circuit
- Disconnect the breakout box from the ECC control module connector.
Check the following cables for an open-circuit according to according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault :
- the cable between fuse 12 (15 A, negative side) and relay demister (1) (terminal 3 on the relay base socket).
- the cable between the demister relay (1) (terminal 4 on the base socket) and ECC control module connector terminal 24.
Is there an open-circuit in any of the cables?
Yes - Verification
No - Replacing the component
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Replacing the component
Replace the defroster relay in the in the integrated relay / fusebox.
Continue - Verification
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Checking for a short-circuit
Check the following cables for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault :
- the cable between fuse 12 (15 A, negative side) and relay demister (1) (terminal 3 on the relay base socket).
- the cable between the demister relay (1) (terminal 4 on the base socket) and ECC control module connector terminal 24.
Is there a short-circuit to ground in any of the cables?
Yes - Verification
No - Replacing the component
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Replacing the component
- Replace fuse 12 (15 A) in the integrated relay / fusebox in the passenger compartment.
Continue - Verification
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Verification
Verification
Hint: Check after repair that the fault has been rectified.
- Ignition off.
- Connect the connectors, reinstall components etc.
- ECC control module connected.
- Ignition on.
Does the symptom recur?
Yes - VERIFICATION FAILED
No - VERIFIED
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VERIFIED - FAULT FOUND
VERIFICATION FAILED - Fault-tracing information
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Fault-tracing information
Information
Attempt New Test - Connecting the breakout box
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