Pinpoint Test I: The Autolock Does Not Operate Correctly
Locks, Latches and Entry Systems
Pinpoint Tests
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 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 Cluster (IC) sends the vehicle speed signal and TR signal over the Medium Speed Controller Area Network (MS-CAN) to the SJB.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Programming
- Door ajar switches
- TR sensor message
- Vehicle speed signal message
- SJB
PINPOINT TEST I: THE AUTOLOCK DOES NOT OPERATE CORRECTLY
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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.
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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 Courtesy Lamp. Testing and Inspection
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I3 CHECK THE SJB PID (IGN_R_ECU)
- Enter the following diagnostic mode on the scan tool: SJB DataLogger.
- Ignition ON.
- Monitor the SJB 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. Testing and Inspection
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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.
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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.
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I6 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB 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. 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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