Pinpoint Test A: The Alarm System Does Not Arm/Disarm From The Driver Door Lock Cylinder
Anti-Theft
Pinpoint Test A: The Alarm System Does Not Arm/Disarm From The Driver Door Lock Cylinder
Refer to Wiring Diagram Set 117, Remote Keyless Entry and Alarm for schematic and connector information. Diagrams By Number
Normal Operation
The Body Control Module (BCM) monitors the driver door lock through the set/reset switch (part of the driver door latch) and the set and reset input circuits. When a key in the door lock cylinder is turned to the LOCK position it grounds the set circuit signaling the BCM to arm the alarm. When a key in the door lock cylinder is turned to the UNLOCK position it grounds the reset circuit signaling the BCM to disarm the alarm. The driver door latch uses a dedicated ground circuit for the door ajar and set/reset switches.
- B10B1:92 (Cabin Set/Reset Switch: Performance or Incorrect Operation) - a continuous and on-demand DTC that sets when the BCM detects a short to ground on the driver door lock cylinder set or reset input circuits.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Door set/reset switch (part of the driver door latch)
- BCM
PINPOINT TEST A: THE ALARM SYSTEM DOES NOT ARM/DISARM FROM THE DRIVER DOOR LOCK CYLINDER
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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A1 CHECK THE RECORDED BCM DTCs FROM THE SELF-TEST
- Check the recorded results from the BCM self-test.
- Is DTC B10B1:92 present?
Yes
GO to A2.
No
GO to A4.
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A2 CHECK THE DRIVER DOOR LATCH FOR A SHORT TO GROUND
- Disconnect: Driver Door Latch C525.
- Clear the BCM DTCs.
- Repeat the BCM self-test.
- Is DTC B10B1:92 still present?
Yes
GO to A3.
No
INSTALL a new driver door latch. REFER to Handles, Locks, Latches and Entry Systems Front Door Latch. TEST the system for normal operation.
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A3 CHECK THE SET/RESET CIRCUITS FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: BCM C2280G.
- Measure the resistance between the BCM C2280G-6, circuit CPL29 (YE/GY), harness side and ground, and between the BCM C2280G-19, circuit CPL28 (VT/BN), harness side and ground
- Are the resistances greater than 10,000 ohms?
Yes
GO to A7.
No
REPAIR the circuit in question for a short to ground. CLEAR the DTCs. TEST the system for normal operation.
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A4 CHECK THE COURTESY LAMP OPERATION
- Open and close the driver door while checking the courtesy lamp operation.
- Do the courtesy lamps operate correctly?
Yes
GO to A5.
No
REFER to Interior Lighting Testing and Inspection to diagnose the driver door ajar input concern.
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A5 CHECK THE DRIVER DOOR LATCH
- Disconnect: Driver Door Latch C525.
- Enter the following diagnostic mode on the scan tool: BCM DataLogger.
- Monitor the BCM PID (KCS_DRVR) while connecting and disconnecting a fused jumper wire between the driver door latch C525-1 CPL29 (YE/GY), harness side and ground, and between the driver door latch C525-2 CPL28 (VT/BN), harness side and ground
- Does the PID indicate LOCK and UNLOCK when the jumper wire is connected?
Yes
INSTALL a new driver door latch. REFER to Handles, Locks, Latches and Entry Systems Front Door Latch. TEST the system for normal operation.
No
GO to A6.
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A6 CHECK THE SET/RESET CIRCUITS FOR AN OPEN
- Ignition OFF.
- Disconnect: BCM C2280G.
- If the PID did not indicate UNLOCK, measure the resistance between the BCM C2280G-19, circuit CPL28 (VT/BN), harness side and the driver door latch C525-2, circuit CPL28 (VT/BN), harness side.
- If the PID did not indicate LOCK, measure the resistance between the BCM C2280G-6, circuit CPL29 (YE/GY), harness side and the driver door latch C525-1, circuit CPL29 (YE/GY), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to A7.
No
REPAIR the circuit in question for an open. TEST the system for normal operation.
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A7 CHECK FOR CORRECT BCM OPERATION
- Disconnect all the BCM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the BCM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new BCM. REFER to Multifunction Electronic Modules Body Control Module (BCM). TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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