| Subject: | Radio Displays "LOCKED" or "THEFT LOCK" |
| Models: | 2007-2008 Cadillac Escalade, ESV, EXT |
| 2007-2008 Chevrolet Avalanche, Silverado, Suburban, Tahoe |
| 2007-2008 GMC Sierra, Yukon, Yukon Denali, Yukon XL, Yukon Denali XL |
This PI was superseded to update models. Please discard PIT4007B.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some technicians may find the radio displays "LOCKED" or "THEFT LOCK" after replacing the radio. The radio theft deterrent system disables radio functionality if the VIN information sent by the BCM does not match the vehicle VIN information contained in
the radio. The radio receives the vehicle VIN information from the BCM via GMLAN. If a radio is replaced or swapped from another vehicle the radio will need to relearn the VIN information from the vehicle before it will function. If the VIN information of
the vehicle does not match the learned VIN information in the radio, it will display "LOCKED" or "THEFT LOCK".
Recommendation/Instructions:
Currently, performing the radio setup as described in SI (Document ID # 1745049) will NOT successfully learn the vehicles VIN information for the new radio. Engineering is aware of this and working on a correction, however the following steps can be performed
to resolve this condition until the new service information is released:
- Perform the radio setup in SI (Document ID# 1745049) as well as,
- Perform a VIN relearn. To perform the VIN relearn, build the Tech 2 as follows:
| • | F6: Body and Accessories |
- When prompted to erase the theft data: "select yes"
- Shut the key off for 60 seconds and remove the Tech 2 from the vehicle.
- After sixty seconds has elapsed, the VIN should relearn upon start up.
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.
