Checking The Component And Wiring

Check the signal cable between central electronic module (CEM) terminal #B29 (#29) and twilight sensor connector terminal #4. Check for an open-circuit. Check for a short-circuit to supply voltage.

Check the ground lead between central electronic module (CEM) terminal #B28 (#28) and twilight sensor connector terminal #5. Check for an open-circuit. Check for a short-circuit to supply voltage.

Replace the twilight sensor if no fault is found in the wiring.

Remedy as necessary.

Other information 

• see CONNECTING THE BREAKOUT BOX, CENTRAL ELECTRONIC MODULE (CEM)
• see SIGNAL DESCRIPTION CENTRAL ELECTRONIC MODULE (CEM)
• see CONTROL MODULE RELAY BOX PASSENGER COMPARTMENT
• see SUN SENSOR
• see CHECKING WIRING AND TERMINALS

Fig 1: Identifying Connector Terminals

Courtesy of VOLVO CARS CORPORATION

Fig 2: Identifying Ohm Meter

Courtesy of VOLVO CARS CORPORATION

Fig 3: Identifying Twilight Sensor

Courtesy of VOLVO CARS CORPORATION

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  Refer to VERIFICATION