Quote:
Originally Posted by Tech II
Looking at the wiring diagram, it does not give the location of the relay...it shows it being external to the EBCM/EBTCM......chances are it's hanging somewhere in the engine compartment by itself or with other relays...
I see 3 connectors going to the EBCM/EBTCM module......C2, has terminal C(red) that is the power from the relay, so you can back probe that connector to see if you are getting power from the relay(key on).....C2 terminal D(blk) is your ground circuit......so if you back probe terminals C and D of C2, and turn the key on, the test light should light verifying power from relay, and a good ground....remember, all 3 connectors have to be attached to the module for this test....
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You've heard the stories about the apprentice that was sent into town to get a pail of steam, right? That was me today, LOL
On our '99 Pontiac Montana van, I pulled the left side of the engine compartment apart in search of the electronic brake relay. Removed the speed control, the brace that runs from the shock tower to the front rad cradle, and the recovery tank as well to create more access.
Looked high and low. Nothing. I did find one red wire (actually a heavy duty one I would guess to be 10 or 12 gauge), but it didn't terminate at the ABS or Traction Control unit.
There are four heavy gauge (10 to 12 gauge) wires plugging into the TC unit, but none of them are red (memory tells me they are blue, yellow, white and black).
Now that the drier weather has returned, the ABS / TCS is sometimes on, and sometimes off. It seems to cycle off for no clear reason while driving, not even touching the brakes.
The sound the ABS makes when it goes 'off' is like someone pulled the 10 Amp IGN ABS TCS fuse while the vehicle was in motion, and then the fuse gets replaced BUT, because the vehicle is in motion when this interruption occurs, the ABS / TCS gets confused and turns off.
If the key is simply left in the 'run' position with the engine off, the ABS / TCS light comes on when the fuse is pulled, and then goes out when the fuse is replaced. The only time the ABS tries to reset itself after this 'power fail' is when the engine is running.
I understand that the circuit connected to the 10 Amp IGN ABS is designed to energize the ABS / TCS 'relay' when the ignition is on, and the relay handles the higher current load the ABS demands when activated.
I'm beginning to think that there must be a module inside the passenger compartment on the driver's side that may also have the 'relay' OR, the relay is integral with the brake control module next to the ABS unit.
If this last point is true, then we can say goodbye to ABS, because this Delphi TCS module is no longer available.