C70 L5-2.4L Turbo VIN 63 B5244T7 (2003)
Does the sun sensor value change?
Yes - No Fault Found
No - Checking cables
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Checking cables
Check the ECC control module and sun sensor connectors for contact resistance and oxidation according to Checking wiring and terminals. Permanent
fault See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and General Diagnostics/Checking Wiring
and Terminals/Checking Wiring and Terminals. Permanent Fault.
Check ground lead between ECC control module #B10 and sun sensor terminal 4 for an open-circuit according to Checking wiring and terminals.
Permanent fault See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and General
Diagnostics/Checking Wiring and Terminals/Checking Wiring and Terminals. Permanent Fault
Check signal cable between ECC control module #B9 and sun sensor terminal 2 for an open circuit according to Checking wiring and terminals.
Permanent fault See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and General
Diagnostics/Checking Wiring and Terminals/Checking Wiring and Terminals. Permanent Fault , a short-circuit to ground according to Checking wiring
and terminals. Permanent fault See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and General
Diagnostics/Checking Wiring and Terminals/Checking Wiring and Terminals. Permanent Fault , and a short-circuit to supply voltage according to
Checking wiring and terminals. Permanent fault See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests
and General Diagnostics/Checking Wiring and Terminals/Checking Wiring and Terminals. Permanent Fault.
If cables are OK, try a new sun sensor.
Remedy as necessary
Other information:
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To access/replace the sun sensor, refer to Replacing sun sensor (ECC) See: Service and Repair/Removal and Replacement.
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To remove the control module, refer to Replacing ECC control module See: Control Module HVAC/Service and Repair/Removal and
Replacement.
