Checking The Sun Sensor, ECC

Checking the sun sensor, ECC

Checking the sun sensor signal




- Ignition on
- Go into scrolling values
- Read off the sun sensor signal.
Mask the sun sensor. Read the value. Remove the masking. Aim a strong light source (for example a strong flashlight) at close range at the sun sensor.

Note! The value from the sun sensor is updated slowly, so keep the masking / light source in place for approximately 20 seconds.

Check that the value changes.





Does the value of the sun sensor change?

Yes - No Fault Found

No - Checking cables

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Checking cables
Check the sun sensor and climate control module connector B (16-pin). Check for contact resistance and oxidation.
Check the ground lead between climate control module terminal #B8 and sun sensor terminal #1. Check for an open-circuit. Check for a short-circuit to supply voltage.
Check the signal cable between climate control module terminal #B7 and sun sensor terminal #5. Check for an open-circuit. Check for an short-circuit to ground. Check for a short-circuit to supply voltage.
If the wiring is OK, try a new sun sensor.
Remedy as necessary

Other information:
- To access or replace the sun sensor, see Sun sensor Removal and Replacement
- To remove the control module, see Comfort module Removal and Replacement
- To connect the breakout box, see Connecting the breakout box, climate control module Connecting The Breakout Box
- Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault














Continue - Verification

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Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on
- Read off the sun sensor signal.
Mask the sun sensor. Read the value. Remove the masking. Aim a strong light source (for example a strong flashlight) at close range at the sun sensor.

Note! the value from the sun sensor is updated slowly, so keep the masking / light source in place for approximately 20 seconds.

Check that the value changes.





Does the value of the sun sensor change?

Yes - FAULT FOUND

No - Fault-tracing information

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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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Attempt New Test - Checking the sun sensor signal

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