GM Service Manual Online
For 1990-2009 cars only

The tonneau lid will release when the folding top release switch is operated. The folding top cover systems contains the following:

    • Folding Top Lid Latch
    • Folding Top Release Switch
    • Body Control Module (BCM)
    • TONN Rel Relay

When the folding top release switch is operated the BCM receives a grounded open input. When this input is received by the BCM the TONN REL is grounded through the BCM and battery voltage is provided to the folding top actuator. The actuator will then release the tonneau lid.