Question about 2005 Chevrolet Avalanche
Everything electrical inside the truck is going haywire. Dash lights, door locks, radio, blower motor all seem to come on and off intermittently. Even the individual gauges in the dash go all over the place by themselves. It does it while driving, but it also does it sitting in the shop idling.
Posted by Anonymous on
Sounds like bad grounds. Check the cables and connections. Could b a battery with a failing plate that shorts with vibration.
Posted on Jan 23, 2018
The first place to start would be to have a qualified repair shop hook up a factory or professional scan tool an check for DTC'S - diagnostic trouble codes stored in the BCM - body control module .
The body control module (BCM) performs multiple body control functions. The BCM can control devices directly connected to its outputs based on input information. The BCM evaluates this information and controls certain body control systems by commanding outputs on or off. The BCM control inputs can be:
• Sensors and switches that are directly connected to the BCM
• Class 2 serial data received from other control modules connected to the class 2 serial data link
The BCM is also capable of controlling other vehicle systems that are not directly wired to the BCM. The BCM does this by sending specific messages on the class 2 serial data link. The control module capable of performing the required function will respond to the BCM message.
The BCM controls these functions:
• Audible warnings--Refer to Audible Warnings Description and Operation in Instrument Panel, Gages and Console.
• Automatic door locks--Refer to Power Door Locks Description and Operation in Doors.
• Automatic headlamp control--Refer to Exterior Lighting Systems Description and Operation in Lighting Systems.
• Interior lighting--Refer to Interior Lighting Systems Description and Operation in Lighting Systems.
• Keyless entry (AUO option)--Refer to Keyless Entry System Description and Operation in Keyless Entry.
• Passlock theft deterrent--Refer to Vehicle Theft Deterrent (VTD) Description and Operation in Theft Deterrent.
• Retained accessory power (RAP)--Refer to Retained Accessory Power (RAP) Description and Operation .
Then if no DTC'S , pick one of the systems messing up . Test electrical circuit , using a wiring diagram an a DMM- digital multi-meter . Watch this video , not same model or make ,watch how this professional tech diagnose's
Chrysler Pacifica TIPM Electrical Problems
Posted on Jan 23, 2018
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Posted on Jan 02, 2017
Try unhooking the battery, turn key on, leave door open, then connect battery, start engine immediately. The battery saver module thinks it's saving your power!!
Posted on Jul 25, 2009
Several GM products, including the Chevrolet Impala and Malibu, the Oldsmobile Alero, the Pontiac Grand Prix, and Saturn Ion, have issues with the Security light coming on. This is many times an indication of a failing Body Control Module (BCM). Initially, the Security light will come on then go off, progressing to a constant on light, before the car will refuse to start. Other symptoms may include erratic action of electronics, a clicking sound coming from the glove box, and the air conditioning failing to blow cold air. I recommend a shop that specializes in the electronic systems of vehicles to diagnosis and make the necessary repairs. They should keep the car until they replicate the symptoms described. A new BCM from GM should cost about $230; plan on another $200 for them to diagnose the problem, replace the unit, and program the new unit. The dealers quote between $700 and $1,100 for the same repair. My experience and the experiences I have read on the internet, indicate the new BCM should last only about a year.
Posted on Aug 14, 2009
You need to remove the carpet on the passengers side and check the wireing harness,take off the tape and visually inspect it.You are likely to find broken splices ,bare wires or wires shorted to each other or to ground.
Posted on Dec 08, 2009
Check for fuses and fusible links that may be tripped or blown.
Next, check for grounding issues someplace easy to reach like the heated seat connectors.
Most dummy lights work by choosing the warning light path over the circuit path when the circuit path is higher resistance. Which may explain your dash warning lights.
So, what I am trying to say is...you are looking for a open ground in a big big place....like under the hood at one of the major fuse/relay/fusible link points.
Check it out. Good luck and be careful.
Posted on Dec 21, 2009
may hav a instrument cluster failure-and a related module-there r techs who specialize in that repair-go to advance n get a scan n askum
Posted on Jan 06, 2010
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