Checking components and wiring

Check the voltage between the left and right-hand stop lamps and the output on the rear electronic module (REM). The voltage must be approximately 12 V when the stop lamp is activated.

Check the control signal cable. Check for an open-circuit. Check for a short-circuit to supply voltage.

Take readings between:

S60 

• Rear electronic module (REM) terminal #B3 (#3) and stop lamp terminal #B4.

S80 

• Rear electronic module (REM) terminal #D18 (#18) and stop lamp terminal #7.

V70/XC70 

• Rear electronic module (REM) terminal #B3 (#3) and stop lamp terminal #B2.

XC90 

• Rear electronic module (REM) terminal #B3 (#3) and stop lamp terminal #A5.

Check the cable between central electronic module (CEM) terminal #A15 (15) and rear electronic module (REM) terminal #A18 (18). Check for a short-circuit to supply voltage. Check for an open-circuit.

Remedy as necessary.

Other information 

• Central electronic module (CEM): Connecting the breakout box
• Rear electronic module (REM): Connecting the breakout box
• Central electronic module (CEM):
  • -2004: see Signal specification
  • 2005-: see Signal specification
• Rear electronic module (REM): Signal specification
• See Central electronic module (CEM), replacing
• For -2004, see: Integrated relay/fusebox cargo compartment/Rear electronic module (REM), replacing
• For 2005-, see: Rear electronic module (REM), replacing .
• See Stop lamp, rear windshield, replacing
• See Checking wiring and terminals

• Continue 

  Refer to Verification