Question about 1995 Oldsmobile Ninety Eight

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Rear center stop lamp socket

The part that the center stop lamp plugs into has a broken off part causing light to go off intermently

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04 malibu ls 3rd brake lite rear lite stay on when 3rd brke light is plugged inbrake lights wont get brighter when brke pressed If 3rd brake lite is unplugd brke lights work unplugged 3rd brake light


Do you know anything about automotive electronic's ? The brake pedal position sensor is a input to the BCM - body control module ,the BCM turns on the stop lamps . Possible short in the (CHMSL ) - center high mount stop lamps , wiring etc.... Causing problem inside the BCM . Do you know what wiring diagrams are ? Free one's here http://www.bbbind.com/free-tsb Enter vehicle info. year , make , model an engine size . Under system click on lighting , then under subsystem click on exterior lighting . Click the search button then the blue link's . First diagram show's the brake pedal position sensor input to the BCM ,lower right . Second diagram show's BCM power supply to the third brake light (CHMSL) . Having a qualified repair shop with a professional scan tool to check for DTC'S - diagnostic trouble code's could save a bunch of time in diagnosing the problem .
DTC B3903
The body control module (BCM) supplies voltage to the center high mount stop lamp (CHMSL) and the powertrain control module (PCM) when the stop lamps are active.
DTC B3903 Stop Lamp Relay Circuit

Stop Lamps
The body control module (BCM) is responsible for controlling the stop lamps. When the driver presses the brake pedal, the BCM will receive a signal from the brake pedal position sensor. The BCM then supplies battery positive voltage to both left and right stop lamp assemblies and to the center high mounted stop lamp (CHMSL). The stop lamps are grounded at G401 and G403. The CHMSL is grounded at G302.

Oct 05, 2018 | Cars & Trucks

1 Answer

2004 chevy impala brake light isses switch has been replaced and so have fuses and bulbs still no lights


Do you know how to test using a DVOM - digital volt ohm meter ? Is there B+ voltage going into the brake light switch ? An coming out when the brake pedal is pressed ? What fuse's ? There is only one fuse for the brake lights !
The BRAKE SW fuse in the RH I/P fuse block supplies battery positive voltage to the normally-open stop lamp switch. When you press the brake pedal the switch contacts close and battery positive voltage is supplied to the left and right stop lamp assemblies and to the center high mounted stop lamp (CHMSL). The left and right stop lamp along with the CHMSL are grounded at G302.
Do you know about the right insturment panel fuse box ?
Stop Lamps Inoperative
Step
Action
Yes
No
Schematic Reference: Exterior Lights Schematics
1
Did you perform the Lighting System Diagnostic System Check?
YES - Go to Step 2
NO - Go to Diagnostic System Check - Lighting Systems
2
Press the brake pedal.
Do all of the stop lamps illuminate?
YES - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
NO - Go to Step 3
3
Are all the stop lamps inoperative?
YES - Go to Step 4
NO - Go to Step 7
4
Inspect the BRK SW fuse.
Is the fuse open?
YES - Go to Step 14
NO - Go to Step 5
5
Disconnect the stop lamp switch.
Using a test lamp connected to ground, probe the battery supply voltage circuit of the stop lamp switch connector.
Does the test lamp illuminate?
YES - Go to Step 6
NO - Go to Step 13
6
Install a fused jumper between the battery supply voltage circuit and the stop lamp switch signal circuit of the stop lamp switch connector.
Do the stop lamps illuminate?
YES - Go to Step 12
NO - Go to Step 17
7
Determine if the center high mounted stop lamp is inoperative or the stop/turn lamps are inoperative.
Are the stop/turn lamps inoperative?
YES - Go to Step 8
NO - Go to Step 9
8
Do the turn lamps operate normally?
YES - Go to Step 17
NO - Go to Turn Signal Lamps and/or Indicators Inoperative
9
Disconnect the center high mounted stop lamp.
Using a test lamp connected to ground, probe the stop lamp switch signal circuit of the center high mounted stop lamp at the harness connector.
Press the brake pedal.
Does the test lamp illuminate?
YES - Go to Step 10
NO - Go to Step 15
10
Using a test lamp, probe between the stop lamp switch signal circuit and the ground circuit of the center high mounted stop lamp with a test lamp.
Press the brake pedal.
Does the test lamp illuminate?
Go to Step 11
Go to Step 16
11
Inspect for poor connections at the harness connector of the center high mounted stop lamp. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 20
Go to Step 19
12
Inspect for poor connections at the harness connector of the stop lamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 20
Go to Step 18
13
Repair a open or high resistance in the battery supply voltage circuit of the stop lamp switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 20
--
14
Repair a short to ground in one of the following circuits:
• The battery supply voltage circuit of the stop lamp switch
• The stop lamp switch signal circuit of the stop lamp switch
Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 20
--
15
Repair a open or high resistance in the stop lamp switch signal circuit of the center high mounted stop lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 20
--
16
Repair an open or high resistance in the ground circuit of the center high mounted stop lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 20
--
17
Repair an open or high resistance in the stop lamp switch signal circuit of the stop lamp switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 20
--
18
Verify the stop lamp switch adjustment. Refer to Stop Lamp Switch Adjustment . If OK, replace the stop lamp switch. Refer to Stop Lamp Switch Replacement .
Did you complete the repair?
Go to Step 20
--
19
Replace the center high mounted stop lamps. Refer to High Mount Stop Lamp Replacement .
Did you complete the repair?
Go to Step 20
--
20
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 2

Jun 23, 2017 | Cars & Trucks

1 Answer

I have a 2001 jeep grand Cherokee Laredo that did not come with fog lights but has the plugs for the bulbs. I purchased the fog lights plugged them in but they didn't turn on. I was wondering if there...


If this vehicle came prewired, and all you had to do was plug in the fog lamps, then 50A fuse 7 in the power distribution center would be hot at all times, applying power to 15A fuse 24 and the fog lamp relay. Setting the left multifunction switch to FOG causes the body control module to close the fog lamp relay and turn on the fog lamps. It is possible your Jeep came prewired but without the fuses and relay so a dealer could install them to make your fog lamps work. You can check whether the fuses are in the box and OK and whether the fog lamp is installed or just an empty socket. Once everything has been checked and any missing parts installed, your fog lights should work.

Sep 18, 2012 | Cars & Trucks

1 Answer

Lt 35 flashing glow plug light


In my case, the flashing glow plug indicator is caused by me replacing the stop lights with LED bulbs. Therefore, a cause for this flashing indication could be a blown stop light lamp. The test for this condition is; while the glow plug indicator is flashing, press and release the break pedal. This should stop the indicator from flashing. Check your stoplights. Or add a load resistor to your LED lamps if you have fitted these.

Jun 01, 2012 | Volkswagen Volkswagen Cars & Trucks

1 Answer

I am trying to find the location of the fuses for the brake lights on a 2006 Chevy Cobalt sedan


{: ) The stop lamp switch controls the on/off function of the stop lamps including the center high-mounted stop lamp( CHMSL). The stop lamp switch get its power from the Body Control Module (BCM). This power is also fused but is internal to the BCM. You need to check carefully the voltages at the stop lamp switch and its on/off function. If voltage is not present at the stoplamp switch, you can check the C4 connector(light gray in color) at the BCM if there is some loose connection. Otherwise the BCM may not be giving an output voltage and will need to be repaired/replaced. I hope the problem is not caused by the BCM.

Aug 01, 2011 | 2006 Chevrolet Cobalt

1 Answer

2003 GMC ENVOY BRAKES LIGHTS WILL NOT COME ON DID SWITCH THE BULBS


{: ) Check out the ST/LP fuse(25amp) at the underhood fuseblock. Also the VEH STOP (15amp) and VEH CHMSL (10amp) fuses at the fuseblock rear. If the center high mounted stop lamp is also not working, and you can't get any 12volts on either stoplamp bulb sockets, then most likely causes are the fuse, stoplamp switch on the brake pedal, and a faulty wiring.
If the center stop lamp is working and both sides are not, then the trouble can be isolated on the wirings or terminals of the two bulbs on the sides.
Wish you luck.

Jul 08, 2011 | 2003 GMC Envoy

2 Answers

Battery light brake light and stop lamp light on


Sounds like you have a broken belt for the alternator and power steering.

Jun 04, 2010 | 1991 Subaru Legacy

2 Answers

I have a 2000 Dodge RAM 3500 with no lower brake lights. The turn signals work and the hazard lights work so the bulbs are good. The center high mounted stop lamp works but just in case I replaced the...


if the third brake light works then ther is a broken wire. start looking for it at the tail lights and work forward if you cant find the break you can always run a new possitive wire from either the third brake light to the tail lights or if the trailer wiring harness hase power to the brake lights you can splice in there as well. hope this helps

Mar 14, 2010 | 1994 Dodge Ram

3 Answers

Battery dies after sitting for a few hours. Any idea what is draining it?


disconnect battery put a test light between neg of battery and neg of cable if it lights u have a draw if so take out inter lamp fuse if still there put test light back on batt and cable and start removing fuses till lamp goes out then u know what cirit is drawing
common causes glove box lamp int lamp trunk lamp radio good luck

Nov 26, 2009 | 1995 Jeep Grand Cherokee

1 Answer

Brake lights only show on center 3rd high stop tail lamp


Yes, the flasher does interrupt the brake signal. you do know that this is a push on, push off switch. Some try to pull this switch to turn off flashers, but, it has to be pushed again to turn off.

Nov 30, 2008 | 1999 GMC Suburban

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