Question about 1991 GMC Sonoma
There are many plug seals in the firewall where wires run through, use those access points
Posted on Oct 31, 2008
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Posted on Jan 02, 2017
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Instrument cluster indicator control
Fuel gauge control
Temperature gauge control
A/C compressor request
A/C cooling fan
Exterior and interior lighting control for the following lamps:
Daytime Running Lights (DRL)
Automatic lighting control
The Body Control Module (BCM) receives Class 2 serial data messages from the Powertrain Control Module (PCM) to determine the following gauge information:
Engine coolant temperature
Fuel level sensing
Your best bet is to take your vehicle to a qualified repair shop !
Fuel Gage Inaccurate or Inoperative
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