Rick's Free Auto Repair Advice

Airbag light on, security light on, battery light on, low fuel light on, fuel gauge reads empty

Airbag light on, security light on, battery light on, low fuel light on, fuel gauge reads empty

Talk about a nightmare scenario! Start by locating the serial data splice pack connector. It’s to the left of and below the instrument panel fuse block, tape to the body harness. It’s a flat connector with up to 11 wires in it (actual number depends on the options in the vehicle). Look for the blunt end of the connector and remove it.
Next, turn the key to the RUN position and use a digital multimeter to check voltage at each of the serial data wires in the connector. The voltage should be in the millivolt range except on pin A, the purple wire. That wire should not have any voltage. Here’s where the wires go. Terminal Q goes to the DLC, B dark green goes to the vehicle control module, C dark green/white goes to the transfer case control module, D goes to the vehicle interface unit, E light blue goes to the electronic brake control module, F dark blue goes to the inflatable restraint sensing and diagnostic module, G gray wire goes to the instrument panel cluster, J brown/white goes to the driver’s seat adjuster memory seat module, K yellow wire goes to the driver’s information display module, L white wire goes to the electronic climate control module, M light green goes to the body control module.
If you detect 10-11 volts on any of these serial date wires, remove that wire from the splice pack and then reconnect it. Then see if the problem goes away. If it does, you’ve got a short on the removed wire that’s placing voltage onto a serial data bus wire and that’s preventing communication along the data bus. Or, you’ve got a bum module that’s injecting voltage onto the bus. If you unplug that module and the problem goes away, you’ve found the problem

© 2012 Rick Muscoplat

Posted on by Rick Muscoplat

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