Pinpoint Test I: The Autolock Does Not Operate Correctly

Handles, Locks, Latches and Entry Systems

Pinpoint Test I: The Autolock Does Not Operate Correctly

Normal Operation

The Smart Junction Box (SJB) energizes the lock relay based on input from the ajar switches, the ignition switch, the Transmission Range (TR) sensor and the vehicle speed signal. The SJB (Smart Junction Box) locks the doors when the following conditions are met:

- all the doors are closed,

- the ignition switch is in the RUN position,

- the vehicle is shifted into any gear putting the vehicle in motion, and

- the vehicle attains a speed greater than 20 km/h (12 mph).

The Instrument Panel Cluster (IPC) sends the vehicle speed signal and TR (Transmission Range) signal over the Medium Speed Controller Area Network (MS-CAN) to the SJB (Smart Junction Box).

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Programming

- Door ajar switches

- TR (Transmission Range) sensor message

- Vehicle speed signal message

- SJB (Smart Junction Box)

PINPOINT TEST I : THE AUTOLOCK DOES NOT OPERATE CORRECTLY

I1 VERIFY THE AUTOLOCK FEATURE IS ENABLED

- Verify the autolock feature is enabled. Refer to Autolock and Auto-Unlock Programming Autolock and Auto-Unlock Programming.

Is the autolock feature enabled?

Yes
GO to I2.

No
PROGRAM the autolock feature. REFER to Autolock and Auto-Unlock Programming Autolock and Auto-Unlock Programming.

I2 CHECK THE COURTESY LAMP OPERATION

- Open and close the doors while checking the courtesy lamp operation.

Do the courtesy lamps operate correctly?

Yes
GO to I3.

No
REFER to Lighting and Horns.

I3 CHECK THE SJB (Smart Junction Box) PID (IGN_R_ECU)

- Enter the following diagnostic mode on the scan tool: SJB (Smart Junction Box) DataLogger.

- Ignition ON.

- Monitor the SJB (Smart Junction Box) PID (IGN_R_ECU).

Does the PID display RUN?

Yes
GO to I4.

No
REFER to Steering Column to continue diagnosis of the ignition switch.

I4 CHECK THE VEHICLE SPEED OPERATION

- Check the operation of the speedometer.

Does the speedometer operate correctly?

Yes
GO to I5.

No
REFER to Instrument Panel, Gauges and Warning Indicators.

I5 CHECK THE TRANSMISSION RANGE INDICATOR

- Observe the PRNDL display while moving the shift lever through each gear position

Does the PRNDL display operate correctly?

Yes
GO to I6.

No
REFER to Instrument Panel, Gauges and Warning Indicators.

I6 CHECK FOR CORRECT SJB (Smart Junction Box) OPERATION

- Disconnect all the SJB (Smart Junction Box) connectors.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect all the SJB (Smart Junction Box) 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 SJB (Smart Junction Box). 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.