Question about 1994 Volvo 940

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Need wiring diagram/chart for 1994 940

Electrical problems with volvo - no brake lights and also it gets stuck in overdrive by itself quite a bit.  Father in law can fix all these problems if he could find the wiring diagram for this car, but I can't even find the repair manual (I've checked 3 different auto shops).
Thanks,  Susan

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  • A T Dub Sep 26, 2008

    In regards to the brake lights - It WAS the red round bulb behind the fuse panel! My father in law replaced it and it works great! He has not had a chance to check on the overdrive problem. THANK YOU!!!

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If you have no brake lights at all first check voltage in and out of brake light switch above pedel (not the one with vac line) if thats ok then pull the large red round bulb out senser behind the fuse panel and look for the bad solder connection inside it or just replace it/as for the od i think what you are saying is it gets stuck out of od and the engine revs high? the most commen problem is the od relay that is also behind the fuse panel (white ,tall,left side and square) but the best fix is to bypass it all on the trans with a kit from IPD.

Posted on Aug 26, 2008

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Brake lights not working


Inspection and Verification

  1. Visually inspect the following for obvious signs of mechanical or electrical damage.

    Visual Inspection Chart Mechanical Electrical
    • Central junction box (CJB)
    • Brake pedal position (BPP) switch
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    • CJB fuse 2 (20A)
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  1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  1. If the concern is not visually evident, verify the symptom and refer to the Symptom Chart.
Symptom Chart
NOTE: Refer to Wiring Diagrams Cell 90 for schematic and connector information.
Symptom Chart Condition Possible Sources Action
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  • Brake pedal position (BPP) switch.
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