I have to disconnect the battery in order turn the rear lights off.
With the ignition switch off.
With the turn signals off.
Both rear lights are on.
With the left turn signal on:
Left rear lights are off.
Right rear lights are on.
With the right turn signal on:
Right rear lights are off.
Left rear lights are on.
No lights are in front.
With the ignition switch in the 1st position, Same as above.
With the ignition switch in the second position. Same as above except turn signals blink. Front and back.
With the light pull in the first position front and rear fog/parking lights work.
With the light pull in the second position. headlights and rear lights working.
Brake pedal operates the center back window light but not the rear lights.
Emergency flashers work in all key positions.
I'd appreciate any ideas.
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Re: 1989 Cadillac rear lights stay on
It may be a turn hazard module under dash.that is the culprit! The power to the third brake light does not go through the module, but the rear brake lamps power is controlled through this module. I am looking at a drawing of one and it looks like it has two connectors with about five wires in one and six in the other. It has some cooling fins on it also.
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I wouldn't do that given the complexity of electronic modules an data bus communication networks on this vehicle . Disconnecting batteries can cause modules to go to sleep an not wake back up . The ignition switch is an input to the BCM - body control module , the BCM turns on relays powering up systems on the vehicle .
The BCM executes the high power mode by grounding the controlled power relay coil control circuit of the CONTROLLED POWER relay whenever the BCM is awake. This circuit also is grounded for 15 minutes after you turn the ignition switch to the LOCK position in order to obtain the RAP function. After 15 minutes elapse, the BCM enter a sleepstate and transitions to the low power mode. The components under controlled power then receive any necessary voltage from the battery positive voltage circuit of the BCM. If the BCM is in the low power mode, and the BCM detects that the current exceeds approximately 2 amperes, the BCM wakes up and re-enters the high power mode. If the vehicle remains inactive with the ignition in the LOCK position and without any BCM wake-ups for a period of 3 days, the BCM deactivates the low power mode. The following components are under controlled power: There are probably DTC'S - diagnostic trouble codes stored in the BCM . A simple code reader can not read these , an has nothing to do with the check engine light . Battery Disconnect or Replacement Problems You may have been lucky so far disconnecting the battery .
Normally all parking lights are controlled by the light switch. First turn turn on the parking lights and second turn turns on the head lights.
Are you sure it is not your break lights staying on? if this is your break lights - look at break pedal for break light switch staying on or not adjusted correctly. Does your car battery gets drained from your break lights staying on?
The only suggestion I can make is that the turn signal switch is defective and is shorted internally. If you disconnect the turn signal/multifunction switch under the dash do the lights go out in question?
hiya if the rear lights are remaining on ? with no ignition it will be the brake lights staying on this is easily remendied/ checked by trypulling the brake pedal up by hand and see if lights go off ? if so then you will need to adjust the b/light switch which is positioned adjacent to pedal and can be screwed inwards towards the pedal untill the plunger on switch is pushed into the switch which puts lights off ensure pedal is fully up then adjust switch reconnect the wire/plug and press pedal slightly to ensure b/lights operate ok and then go off with pedal released ? on hyundai the brakelights do not req ignition on to operate hence more likely problem is as above good luck