I'm trying to add this feature to my base model SLE Envoy but it doesn't operate.
I obtained the pump connector/fluid level sensor connector harness, spliced the grounds and wired the pump's purple power wire back to the fuse box with a proper terminal. Added a relay (#37). Found a headlamp switch with washer button. Couldn't use it because it didn't have DRL and Canada must have that. So I spent hours/days cutting out the washer button guides and hole from the spare switch and fitting it to my headlamp switch casing; cut the hole, glued the button guides etc. All together now and the BN/Wh and White wires are already there, from headlamp switch connector to BCM and to the fuse box. Press the button and the relay does nothing.
I don't have the pump yet, so I plugged a 12v chime into the pump connector to test it.
If I take the relay cover off and move the arm, the test-chime sounds. If I connect a multi-meter to the BCM connectors, the 12v on BN/Wh at C2-F5 goes to ground when I press the button, so the button-press reaches the BCM. The white wire (BCM C1-A2) does NOT change from 12v when I press the button! It should ground the relay when operating, according to the schematic..
That's clearly why the relay does not operate.
Does the BCM have to be programmed by GM to enable the feature?
(If so, that stinks. Can anyone in Winnipeg Canada area program these modules?)
I obtained the pump connector/fluid level sensor connector harness, spliced the grounds and wired the pump's purple power wire back to the fuse box with a proper terminal. Added a relay (#37). Found a headlamp switch with washer button. Couldn't use it because it didn't have DRL and Canada must have that. So I spent hours/days cutting out the washer button guides and hole from the spare switch and fitting it to my headlamp switch casing; cut the hole, glued the button guides etc. All together now and the BN/Wh and White wires are already there, from headlamp switch connector to BCM and to the fuse box. Press the button and the relay does nothing.
I don't have the pump yet, so I plugged a 12v chime into the pump connector to test it.
If I take the relay cover off and move the arm, the test-chime sounds. If I connect a multi-meter to the BCM connectors, the 12v on BN/Wh at C2-F5 goes to ground when I press the button, so the button-press reaches the BCM. The white wire (BCM C1-A2) does NOT change from 12v when I press the button! It should ground the relay when operating, according to the schematic..
That's clearly why the relay does not operate.
Does the BCM have to be programmed by GM to enable the feature?
(If so, that stinks. Can anyone in Winnipeg Canada area program these modules?)
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