Checking the wiring

Check the wiring between the central electronic module (HEM) and sun sensor. Check for contract resistance and oxidation. Check for damage.

Check the wiring between the central electronic module (HEM) and the sun sensor. Check for a short-circuit to ground.

Take readings between:

• Central electronic module (HEM) terminal #D30 (#30) and sun sensor terminal #1
• Central electronic module (HEM) terminal #D42 (#42) and sun sensor terminal #5.

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

Remedy as necessary.

Other information 

• See Connecting the breakout box
• See Signal specification
• See Sun sensor / alarm LED, replacing
• See Central electronic module (HEM), replacing
• See Contents

Fig 2: Identifying Connector D Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Refer to Verification