2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 249
Circuit/System Description
The ratchet, pawl, and sector switches are part of the liftgate latch assembly and are used by the liftgate module (LGM) to determine the state of the
latch during the process of latching 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 battery voltage
through a resistor and monitored within the LGM. The latch switches share a common low reference circuit from the LGM and when the switch
contacts close the signal circuit goes low and the LGM determines the switch to be active. The full open switch is a limit switch mounted on the
gear motor assembly alongside the swing arm gear. The full open switch signal circuit is supplied battery voltage through a resistor and monitored
within the LGM. When the liftgate reaches the full open position, the switch signal circuit is closed to the low reference circuit and the signal
circuit voltage goes low.
Conditions for Running the DTC
The system voltage is 9-16 volts.
Conditions for Setting the DTC
B153A 00
The LGM detects a fault in any of the following switch signal circuits:
* Ratchet switch
* Pawl switch
* Sector switch
B153A 08
When the LGM detects a loss of B+ voltage, an open/high resistance in the sensor 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
* Pawl switch
* Sector switch
Action Taken When the DTC Sets
* Power open will be disabled.
