Electrical Problems with 2003 GMC 1500HD Sierra

Tiny
MOTFU
  • MEMBER
  • 2003 GMC C1500
Vehicle - 2003 GMC 1500 HD (Crew Cab) Sierra, 6.0 L Gas, 70K miles.

I have a list of electrical components that quit working simultaneously.

Front Passenger Door:
Power Window
Power Lock
Mirror Adjust Functions

Other items that are inoperative:
Keyless entry
Retained Accessory Power (RAP)
Door locks & window lock-out on driver door module
Power mirror fold, both sides

Things I've tried:
All fuses checked and found to be ok.
Disconnected battery for several minutes.
Pulled most relays and accessible circuit breakers.

It seems to me that this list of problems tends to rule out a single component other than the BCM (unless there is a hidden fuse/cb/relay that powers the right bussed connection box).

I have an aftermarket repair manual that leaves me a little dumbfounded.
Can you also address the following questions:
Can't locate fuse, in any, to right bussed connector box.
Can't locate relay, if any, for RAP.
Unsure of BCM location.

Any help would be appreciated.
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Sunday, April 8th, 2007 AT 6:15 PM

3 Replies

Tiny
MREICH
  • MEMBER
I am having a very similar situation. I don't think its related but I recently connected a portable XM radio through an auxiliary adapter.

Have you by chance installed any accessories?
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Monday, April 23rd, 2007 AT 9:23 PM
Tiny
MOTFU
  • MEMBER
I have an aftermarket XM radio unit installed, but it was installed approximately 3 years ago. Nothing new. I came back from a week long trip and started having problems.

FYI - the XM unit I installed consists of a Pioneer XM receiver and an after market adapter that allows receiver to directly interface with the OEM head unit. This allows direct XM signal input to the OEM head unit and it also maintains steering wheel control functionality, including the XM hardware. It looks and acts like a factory XM radio unit.

I guess it is possible that the XM adapter unit has caused a problem with the BCM. I previously installed a seperate power switch for the XM adapter. I will try cycling that to see it might help.

I've been told that the BCM trouble codes can be displayed through the Driver Info Center (DIC). Do you know if there is any way to access those codes?

Do you know where I can get a copy of the interior wiring schematic for this vehicle? 2003 1500 HD Sierra.
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Tuesday, April 24th, 2007 AT 8:08 PM
Tiny
MREICH
  • MEMBER
OK, Update:
I broke down and went to the dealership. The problem was a faulty window or door switch (don't remember which) in the passenger door. I didn't believe it. In fact I really questioned the technician but was proven wrong. The downside was it cost me $300, $157 for switch assembly, $140 for labor.

I can't imagine that my XM aux adapter caused this but just to make sure; I moved the power from the radio harness to the cigarette lighter circuit.

The keyless entry also had to be reprogrammed.

Hopefully this helps someone. A junkyard switch assembly has to be less than $157.
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Thursday, May 3rd, 2007 AT 8:56 PM

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