Power Liftgate Inoperative With Key Off - keywords ignition rear tailgate
| Subject: | Power Liftgate Inoperative With Key Off |
| Models: | 2007 -2008 Cadillac Escalade, Escalade ESV |
| 2007 -2008 Chevrolet Suburban, Tahoe |
| 2007 -2008 GMC Yukon, Yukon XL, Yukon Denali Models |
| with Power Rear Liftgate (RPO E61) |
This PI was superseded to update model years. Please discard PIT4116A.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some customers may state the power liftgate is inoperative from all the switches and the keyless entry transmitter only with the ignition in the off position. If the ignition is in the accessory or the run position, the liftgate will operate correctly.
Recommendation/Instructions:
If you experience this concern, check for power on the "Accessory Wake Up Data Line "going to the ECM and the TCM. With the key in the accessory position, check for battery voltage on circuit 5985 going to pin 18 of connector 1 of the ECM and Pin 11 (MT1 Transmission) or Pin 9 ( for MYC transmission) to the TCM.
If no voltage is present with the key in the accessory position, check for a wiring or pin fit concern
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
