1988 Toyota Camry No rear/side/instrumentation lights

Tiny
1JIBTRUCK
  • MEMBER
  • 1988 TOYOTA CAMRY
Electrical problem
1988 Toyota Camry 4 cyl Two Wheel Drive Automatic

Have brake, flashers, and headlights. Fuses good at guage and lights. Rear light relay tests good. When I key 'on' and turn combination sw to first position-coil side of relay base reads 12v on one side and a rapid pulsing of voltage on the other side.(Describing the two f-male relay coil-operating connections#1 at the fuses/relays block, left kickplate at driver's side). I can get all running lights IF I jumper the switch side(#3)of the running light relay but when I advance the combination sw to include turning on the headlights the headlights pulse with the same frequency I metered at the one side of the rear light relay base connector-until I close the driver's door and then the headlights cease pulsing and stay on as normal. When they pulse the head relay (underhood) can be heard cycling off at the same pulse rithym. I tried fooling the light failure sensor removing a bulb to see if there was a telltale in the dash cluster to no avail. Opened and inspected the failure sensor for burnt components, broken components-none observed-looks very good. If I plug it in all running lights work(with the jumper wire in place at the rearlight relay 'base'), and if I unplug the sensor conn. And jumper between the two greens(G=LG) then it's no rear running lights, only side marker lights. With the jumper wire in place acting as a closed swithch in place of the running light relay I get all running lights-and all the interior panel lights and the dashboard dimmer work perfectly. What's cancelling out the draw-down coil at the rear light relay and why the unusual feedback from the headlight relay when I jumper and then open the Driver's door? No measured shorts or grounds, all wires and connections seem good. Car has about 162000 mi. And otherwise runs terrific.
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Wednesday, January 13th, 2010 AT 1:26 PM

3 Replies

Tiny
JACK42
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Sounds like a bad headlight (Combo) switch. Could be a poor contact inside the switch causing the feedback from another circuit. Since it works when jumpered at relay, it sounds like the trigger of therelay (switch) is th eproblem. The solid 12 volts at relay is most likely power feed
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Wednesday, January 20th, 2010 AT 4:23 PM
Tiny
1JIBTRUCK
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I don't believe THIS! While waiting for your mechanics' imputs, I continued to test switch/relay components. In exasperation one evening I started the car and, suspecting the combination switch as you did, I turned it to the running lights position-no headlights----and out from the left floor kickpanel came a sound that can only be described by taking a screen door spring, pulling it away from the door, and letting it snap back to slap the wood frame. Now EVERYTHING WORKS. PERFECTLY, as in "When we first got the car."Perfectly. Is it possible that the steering mounted combo switch had dirty contacts. Or did I have a relay with welded contacts? Nothing showed when I metered the relays before and after applying a 12volt operating source for the draw-down coils in each relay to verify contact closure. The 'Screen-door' sound only happened once-and after multiple switch operations over succesive weeks neither the problem or the sound has re-occured. A medical first, a self-healing Toyota?
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Friday, February 26th, 2010 AT 6:44 PM
Tiny
JACK42
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Please keep that to yourself or I could be out of a job ! LOL Im not sure what you heard, the combo switches do have contact point issues, but if you bypassed it with power trigger not sure what happened. Id keep that car though.
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Saturday, February 27th, 2010 AT 8:06 AM

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