Signal Too High
Signal too high
Checking the function
- Ignition on.
Check the sun sensor signal: Vary the intensity of the light that it detects. Cover the sun sensor with your hand to obtain the minimum signal, approximately 0 W/m2.
Then aim a strong light source (for example a flashlight) at the sun sensor from close range to increase the signal.
Hint: If the signal from the sun sensor is a steady 200 W/m2either there is an open-circuit in the cable or the sun sensor is defective.
Click on the VCT2000 symbol to read off the sun intensity.
Note! The illustration only shows the method. The appearance of the sun sensor can vary between different models.
Does the value change?
Yes - Checking connectors and wiring
No - Checking the connector
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Checking the connector
- Ignition off
- Check the control module connector (terminals #B4, #B5) and the sun sensor connectors. Check for contact resistance and oxidation. Check for damage carefully.
Other information:
- To access or replace the control module, see Climate control module (CCM), replacing Service and Repair
- To access or replace the sun sensor, see Sun sensor / alarm LED, replacing Service and Repair
- Checking wiring and terminals Checking Wiring And Terminals.
Was a fault detected?
Yes - Verification
No - Checking components and wiring
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Checking components and wiring
Check the signal cable between control module terminal #B4 (#4) and sun sensor terminal #1 (#21). Check for an open-circuit. Check for a short-circuit to supply voltage.
Check the ground lead between control module terminal #B5 (#5) and sun sensor terminal #5 (#25). Check for an open-circuit. Check for a short-circuit to supply voltage.
Replace the sun sensor if no fault is found in the wiring.
Remedy as necessary.
Other information:
- To access or replace the control module, see Climate control module (CCM), replacing Service and Repair
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box, Climate Control Module (CCM)
- To access or replace the sun sensor, see Sun sensor / alarm LED, replacing Service and Repair
- For other values, see Signal specification Pinout Values and Diagnostic Parameters
- Checking wiring and terminals Checking Wiring And Terminals.
Continue - Verification
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Checking connectors and wiring
Check the control module connector (terminals #B4, #B5) and the sun sensor connector. Check for contact resistance and loose connections. Check for oxidation.
Check the signal cable between control module terminal #B4 (#4) and sun sensor terminal #1 (#21). Check for an intermittent open-circuit. Check for a short-circuit to supply voltage.
Check the ground lead between control module terminal #B5 (#5) and sun sensor terminal #5 (#25). Check for an intermittent open-circuit. Check for a short-circuit to supply voltage.
Other information:
- To access or replace the control module, see Climate control module (CCM), replacing Service and Repair
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box, Climate Control Module (CCM)
- To access or replace the sun sensor, see Sun sensor / alarm LED, replacing Service and Repair
- For other values, see Signal specification Pinout Values and Diagnostic Parameters
- Checking wiring and terminals Checking Wiring And Terminals.
Continue - Verification
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Verification
Hint: After the repair it is necessary to check that the fault has been rectified.
- Ignition off.
- Connect the connectors, install the components, etc.
- Ignition on.
Check solar input signal by varying light intensity on solar sensor. Cover solar sensor, for example with hand, to get minimum signal. Shine, for example, a powerful torch close to the solar sensor to get a maximum signal.
The value should vary between approximately 0 and 1000 W/m2.
Is the value OK?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFIED - Fault Found
VERIFICATION FAILED - Information
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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
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Attempt New Test - Checking the function
FAULT-TRACING FAILED - No Fault Found
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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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FAULT FOUND - Fault Found
Attempt New Test - Checking the function
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