I am having a problem with some of the lights on my instrument panel. The biggest problem is with the brake warning light (supposed to come on when the parking brake is engaged) since I need that to pass state inspection. The light also doesn't come on during the power on self test (when the key is first turned to on). The brake warning light I am referring to is inside the RPM/tach guage. The other lights that aren't lighting up are the 1/4 shift and the airbag both of which are next to the brake warning light. I have posted a video on youtube showing this.

Youtube video - click here

I tested the switch on the parking brake and it is functioning correctly and has 11.1 volts on the terminal that connects to the switch. I doubt this is the problem anyway since more than one light isn't working on the instrument panel.

I also pulled the codes:
P0804 H C
B2578 H
B2583 H
B0521 H
U1064 H (both R and L)
C2100 H

The cigarette lighter fuse was blown (which I replaced). This probably happened while I had the radio bezel removed to adjust the shifter. It works fine now. I also checked fuses 19 and 21 (Instrument Panel Control and Brake-Transmission Shift Interlock) swapped them with the fuse for the drivers seat (which I know works). Still no brake warning light.

So, please help. Other fuses that need to be checked? Something related to the error codes? Other advise? I am past due on my inspection.

The car is a 99 6-speed coupe on which the previous owner installed a 1-4 skip shift eliminator. Other than that the car is stock except for a few cosmetic items.

 

The P0804 indicates that the car has recognized that the skip shift (1 to 4 shift) light is not working when commanded on by the PCM.

The B2578 indicates a problem with the RIGHT Front DRL. This is set by the BCM when it sees a solid voltage on the right hand turn signal circuit. It expects an oscillating voltage rather than a continuous voltage on that circuit. I would delete the DTC and see if it returns.

The B2583 is exactly the same as the B2578, but for the LEFT Front DRL. Delete this one also and see if it returns.

The B0521 indicates that the IPC was sent engine RPM data of higher than 7400 rpm ..... which is considered "invalid" .... Either you missed a downshift and "buzzed" your engine pretty badly, or hopefully this was a one time glitch. Delete the code and let's see if it comes back.

The C2100 indicates that your Left Front tire pressure sensor is not transmitting data to the car. If you scroll through your tire pressure display the Left Front will display XXX for the pressure. Try reproamming all of the tire sensors to the car. If any of the sensors won't program they probably need replacement. Do a SEARCH as a user (I believe it is Bakersfield ) has posted that he can now replace the batteries, which is much cheaper than replacing the whole sensor.

The Uxxxx codes should be deleted, they are communication errors on the network between computers, and usually can be ignored.
In your video it looks like the airbag light is working, only the BRAKE and SKIP SHIFT lights are out.

You will have to remove the IPC (Instrument Panel Cluster) from the car to further diagnose this problem. Are you willing to do that, or do you want to take it to a dealer ??

 

Thanks for the feedback.

The fasten seat belt light works in the tach display, but the airbag does not light during the power on self test.

I am willing to remove and fix the IPC. I have the service manuals, so the removal/reinstall shouldn't be that hard. What should I be looking for after I take it out?

 

cjcvette- you have PM

 

You originally said ....

The other lights that aren't lighting up are the 1/4 shift and the airbag both of which are next to the brake warning light

The "airbag light" is outside your video and certainly is not "next to" the brake warning light.

Remove the IPC and follow the instructions to replace the light bulbs behind these positions. As you are disassembling the IPC look for connectors to the printed circuit board that are not seated correctly. You either have a connector that has bad contacts or light bulbs that are burned out.

 

Hello All,

Anyone have a "how to" replace the lamps in the DIC?

Kevin

 

Sorry for the delayed response. I got a little time today to look at the problem, not enough time to take the instrument panel out though. Some more information:

1) I verified that the parking brake switch is grounded properly by running a wire from the brown/white wire that goes to the switch to the negative terminal from the battery - still no brake warning light on the instrument panel. If I connect a bulb in series with the brown/white wire the bulb will not light (even though there is 12v on the wire). The same bulb will light if I use the 12v from the cigarette lighter and ground to the parking brake switch.

2) If I jumper the brake fluid sensor the warning light doesn't come on but the DIC does display a low brake fluid warning.


My next step will be to remove the IPC. In order to best prepare myself for the troubleshooting I have a question:

1). How can I have ~12 volts on the ground side of the IPC warning bulb (brown white wire that connects to the parking brake switch) if the bulb is out? Am I shorting out somewhere or is there some sort of bypass circuit? The electrical schematic shows a simple wiring schematic and I don't see how this is possible.

- Corey

 

Your DIC is providing the voltage....
PM me your e-mail address, and I'll send you the procedure on how to change the warning lamps in your IP in word format.
K

 

Check PM

 

E-mail sent

 

I pulled the instruement cluster. Both light bulbs (1-4 shift and brake) were good. I also swapped out the brake bulb with one of the other bulbs that I knew was working. Still no brake or 1-4 shift light during power on self test.

There is also no corrosion, or bad electrical connections that I can see.

Could these problems be related in any way to the P0804 error code?

 

When you disassemble the halves of the cluster to get to the bulbs, you will notice that there is a typical computer ribbon connector that connects the circuit board to the cluster. Check the integrity of the connectors.

I had a couple of bulbs that would not light up and tore into the cluster to replace the "burned-out" bulbs. All of the bulbs were good, so I looked carefully at the ribbon connector and noticed that the ribbon was not tight in the connector. The connector is clipped to the ribbon and then the connector is snapped into the cluster. Check the tightness of the ribbon to the connector, mine was not tight and that solved my problem.

Good luck... GUSTO

 

Problem solved!

The ribbon connections were good, I reseated all of them but it didn't help. I also tested for continuity from the ribbon cable to the circuit board - no problem there.

What fixed the problem was to jumper the ground side of the light bulb to one of the other light bulb grounds:





Since there was continuity to the circuit board, I would assume there is something wrong on the board itself. But it works great now. Thanks for all of the input.