S40 L4-1.9L Turbo VIN 29 B4204T3 (2001)
-
Ignition off
-
Check audio unit connector A and the connector for the back-up (reversing) lamp switch. Check for loose connections, contact resistance and
oxidation
-
Check that the back-up (reversing) lamp switch is not defective. Check that the back-up (reversing) lamp switch is correctly installed and
connected
-
Check the signal cable between audio unit terminal #A5 (#19 on the breakout box) and the back-up (reversing) lamp switch terminal (see the
wiring diagram for the correct terminal). Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.
Hint: With the engine running and back-up (reverse) gear selected, the back-up (reverse) lamp must light. If the lamp does not light there is a fault in the
back-up (reversing) lamp switch or the wiring connected to the circuit. If no fault is found above, fault-trace other systems in the car.
Other information:
-
For information about signals, see Signal specification Audio HU1205 (audio module) See: Pinout Values and Diagnostic Parameters
-
To connect the breakout box, see Connecting the breakout box, Audio HU1205 (audio module) See: Radio, Stereo, and Compact Disc/Testing and
Inspection/Connecting The Breakout Box, Audio HU1205 (Audio Module)
-
Checking wiring and terminals See: Testing and Inspection/Component Tests and General Diagnostics/Checking Wiring And Terminals.
Remedy as necessary.
