Circuit/System Verification

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Individually open and close each vehicle door while observing the door ajar indicator/message. The indicator/message should accurately transition between the door ajar and door closed state when each door is opened and closed.
- If the door ajar indicator/message does not properly transition when each door is opened and closed, refer to Door Ajar Indicator Malfunction .
Open and close the liftgate while observing the liftgate ajar indicator/message. The indicator/message should accurately transition between the liftgate ajar and liftgate closed state when the trunk is opened and closed.
- If the liftgate ajar indicator/message does not properly transition when the liftgate is opened and closed, refer to Liftgate/Liftgate Window Ajar Indicator Malfunction (w/o E61) or Liftgate/Liftgate Window Ajar Indicator Malfunction (with RPO E61) .
Completely lower the driver door window and close all vehicle doors.
Ignition OFF, arm the CTD system using the keyless entry system by pressing the transmitter LOCK button twice. Verify the scan tool CTD Status parameter displays Armed.
- If the parameter does not equal the specified value, refer to Keyless Entry System Inoperative .
Without disarming the system, reach in through the open driver window, unlock and open the driver door. Verify the scan tool CTD Status parameter displays Alarm Active.
- If the parameter does not equal the specified value, replace the BCM.
With the door open, verify the vehicle horn is pulsing and the exterior lamps are flashing.
- If the horn is not pulsing, refer to Horns Malfunction (w/o VD1) or Horns Malfunction (with VD1) .
- If the exterior lights are not flashing, refer to Turn Signal Lamps and/or Indicators Malfunction .