Question about 1988 Ford F 250
Come on just before park position on switch but go out in headlamp position. Brake and signal work fine.
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Posted on Jan 02, 2017
On vehicles that use a common bulb for signal and brake lights the brake light circuit runs through the signal switch. A problem in the signal switch can cause the brake lights not to function. Also check your Emergency flasher switch. Hope this helps.
Posted on Apr 11, 2010
Can you just check to make sure the ignition key switch is not staying over to far and not backing off when you try to start it. I had a truck that did that and it messed up my turn signals until I brought the key switch back a little after starting it. Just a simple idea. Be kind with your rating for me. Raz
Posted on Apr 19, 2010
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Jan 17, 2017 | 2007 Chevrolet Equinox
Mar 23, 2016 | Cars & Trucks
Feb 23, 2016 | 2005 Chevrolet Equinox LS
Short to Ground
Short to Voltage
Headlamp Switch Off Signal
Park Lamp Switch On Signal
Headlamp Switch On Signal
2, 3, 4
1. Headlamps Always On
2. Headlamps Inoperative From Switch
3. Unable To Turn OFF Automatic Headlamps
4. Park Lamps Inoperative From Switch
5. Park Lamps Always On
When the headlamp switch is in the OFF position, the body control module (BCM) receives a ground signal through the headlamp switch OFF circuit and an open signal on the park lamp ON circuit and headlamps ON circuit. When the headlamp switch is in the PARK or HEAD position, the BCM receives an open signal through the headlamp switch OFF circuit and a ground signal through the park lamp ON circuit or headlamp ON circuit.
Jul 05, 2015 | 2011 Chevrolet Traverse
The transaxle is not in the PARK position.
The normal headlamps are turned OFF.
The BCM activates the system by grounding CKT 592. This action energizes the DRL relay. This condition allows a reduced voltage to flow to the headlamps. When the headlamp switch is turned to ON, the headlamps operate normally.
The parking brake provides an input to the BCM. When the parking brake is engaged, the DRL remain disabled until the parking brake is disengaged.
May 30, 2015 | 1999 Chevrolet Malibu
The ability of the control modules to communicate through the serial data circuit
The identification of any stored diagnostic trouble codes (DTCs) and their status
The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.
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