2010 Cadillac Truck SRX AWD V6-3.0L Page 625
Circuit/System Verification
Verify DTC B3122, B3123, or B3124 is not set.
If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic
Trouble Code (DTC) List - Vehicle).
Circuit/System Testing
Note: The A24P passenger exterior door handle assembly has two harness connectors. Of these two harness connectors, make sure that only
the T10N passenger door handle keyless entry antenna harness connector is disconnected. Disconnecting both harness connectors will result
in the inability to activate the antenna and cause an improper diagnosis.
1. Ignition OFF, disconnect the harness connector at the T10N passenger door handle keyless entry antenna.
2. Ignition ON, test for less than 1 V between the signal circuit terminal 1 and ground.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K84 keyless entry
control module.
3. Ignition OFF, install a DMM between the signal circuit terminal 1 and ground. Set the DMM to capture DC voltage using the MIN MAX
function.
4. Lock the vehicle doors using the keyless entry transmitter.
5. Activate the antenna by pulling the passenger exterior door handle. Verify the MAX voltage captured by the DMM is greater than.5 V.
瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the K84 keyless entry control module.
6. Install a DMM between the signal circuit terminal 1 and the low reference circuit terminal 2. Set the DMM to capture DC voltage using the
MIN MAX function.
7. Lock the vehicle doors using the keyless entry transmitter.
8. Activate the antenna by pulling the passenger exterior door handle. Verify the MAX voltage captured by the DMM is greater than.5 V.
瀚慖f less than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K84
keyless entry control module.
Note: Install the A24P passenger exterior door handle assembly and verify correct system operation BEFORE painting the assembly. If the
assembly does not correct the concern, return the unpainted part.
9. If all circuits test normal, replace the A24P passenger exterior door handle assembly. Verify DTC B3120 is not set.
瀚慖f the DTC is set, replace the K84 keyless entry control module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Front Side Door Outside Handle Replacement (See: Body and Frame/Doors, Hood and Trunk/Doors/Front Door/Front Door Handle/Front
Door Exterior Handle/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning)for keyless entry control module replacement, setup,
and programming
B3121
DTC B3121
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 Descriptors
DTC B3121 02
- Keyless Entry Antenna 3 Short to Ground
