2010 Cadillac Truck SRX AWD V6-3.0L Page 229
Circuit/System Description
The ratchet, pawl, and sector switches are part of the liftgate latch assembly and are used by the liftgate control module to determine the state of the
latch during the process of cinching or unlatching. The ratchet and pawl switches will be inactive when the primary and secondary latches are
latched, and the sector switch will be active during the power cinch function. Each of the latch switch signal circuits are supplied signal through a
resistor and monitored within the liftgate control module. The latch switches share a common low reference circuit from the liftgate control module
and when the switch contacts close the signal circuit goes low and the liftgate control module determines the switch to be active.
Conditions for Running the DTC
The system voltage is 9-16 V.
Conditions for Setting the DTC
When the liftgate control module detects an open/high resistance in the ratchet, pawl, and/or the sector signal circuit, an open/high resistance in the
liftgate latch low reference circuit, or any incorrect combination of signals from the following switch inputs:
* Ratchet switch
* Sector switch
* Pawl switch
Action Taken When the DTC Sets
* The liftgate may not power open or power close.
* The latch may be inoperative or not function normally.
Conditions for Clearing the DTC
* The DTC will be current for as long as the fault is present.
* When the fault is no longer present, the DTC will be a history DTC.
* A history DTC will clear after 50 ignition cycles.
Diagnostic Aids
* If the liftgate will not release from the closed position, refer to Opening the Liftgate Without Electrical Power (See: Body and Frame/Doors,
Hood and Trunk/Trunk / Liftgate/Service and Repair/Procedures) for the appropriate procedure
* Whenever the liftgate control module loses power or is disconnected, the ignition must be cycled OFF then ON in order to reactivate the
liftgate control module.
* DTC B153A may be set when the vehicle is driven while the liftgate is open, as when the owner transports a large package in the rear of the
vehicle. The DTC will become history after the liftgate is closed and does not affect normal liftgate operation
Reference Information
Schematic Reference
Liftgate Schematics (See: Body and Frame/Locks/Diagrams/Electrical Diagrams/Liftgate Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Liftgate Description and Operation (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Description and Operation/Liftgate)
Electrical Information Reference
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
