2010 Cadillac CTS Sedan AWD V6-3.6L Page 184
瀚慖f greater than specified range, test the signal circuit for a short to voltage. If circuit tests normal, replace the navigation display.
4. Ignition OFF, test for infinite resistance between the signal terminal 13 and ground.
瀚慖f less than specified range, test the signal circuit for a short to ground. If circuit tests normal, replace the navigation display.
5. Ignition OFF, disconnect the X2 harness connector at the radio/HVAC display.
6. Test for less than 5 ohms between the signal circuit terminal 13 X4 at the radio and terminal 5 X2 at the navigation display
瀚慖f greater than specified value, test the circuit for an open/high resistance.
7. If the circuit tests normal, replace the radio.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Radio, Video, Audio Disc Player, and Navigation Information Display Replacement (See: Accessories and Optional Equipment/Radio,
Stereo, and Compact Disc/Radio/Stereo/Service and Repair/Radio, Video, Audio Disc Player, and Navigation Information Display
Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for radio replacement, setup, and programming
B153A
DTC B153A
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B153A 08
- Power Liftgate Latch Switches Signal Invalid
Diagnostic Fault Information
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 signal 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.
Conditions for Running the DTC
The system voltage is 9-16 volts.
Conditions for Setting the DTC
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:
