Pinpoint Test E: Smart Junction Box (SJB) Does Not Enter Sensor Training Mode When Using the Tire Pressure Monitoring System (T

Tire Pressure Monitoring System

Pinpoint Tests

Pinpoint Test E: Smart Junction Box (SJB) Does Not Enter Sensor Training Mode When Using the Tire Pressure Monitoring System (TPMS) Sensor Training Procedure

Normal Operation

For the Smart Junction Box (SJB) to enter Tire Pressure Monitoring System (TPMS) sensor training mode, the SJB must receive valid inputs from the brake pedal position switch (OFF-ON-OFF) and ignition switch (both OFF and RUN), and it must receive valid vehicle speed sensor input (0 km/h [0 mph]). Refer to Tire Pressure Monitoring System (TPMS) Sensor Training Tire Pressure Monitoring System (TPMS) Sensor Training for the complete sensor training procedure.

This pinpoint test is intended to diagnose the following:
- Brake pedal position switch concern
- Ignition switch concern
- SJB


PINPOINT TEST E: SJB DOES NOT ENTER SENSOR TRAINING MODE WHEN USING THE TPMS SENSOR TRAINING PROCEDURE

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E1 CHECK THE SJB BRAKE ON/OFF (GEM_BOO) PID


- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger SJB.
- Monitor the SJB brake pedal position GEM_BOO PID.
- Press and release the brake pedal while monitoring the PID.
- Do the brake pedal PID values match the brake pedal positions?

Yes
GO to E2.

No
REFER to Exterior Lighting Testing and Inspection to continue diagnosis of the brake pedal position switch.

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E2 CHECK THE SJB IGNITION SWITCH PIDs


- Monitor the following SJB ignition switch PIDs:
- Ignition Switch Off (IGN_O_ECU)
- Ignition Switch RUN (IGN_R_ECU)
- Cycle the ignition switch to the RUN and OFF position while monitoring the PIDs.
- Do the ignition switch status PID values match the ignition switch positions?

Yes
GO to E3.

No
REFER to Steering Column Switches Initial Inspection and Diagnostic Overview to continue diagnosis of the ignition switch.

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E3 CHECK THE IPC VEHICLE SPEED (SPDOMETER) PID


- Monitor the IPC SPDOMETER PID ( SJB receives vehicle speed from the Instrument Panel Cluster (IPC)).
- Is the vehicle speed less than 5 km/h (3 mph)?

Yes
GO to E4.

No
REFER to Instrumentation, Message Center, and Warning Chimes Instrumentation, Message Center and Warning Chimes to continue diagnosis of the IPC/vehicle speed concern.

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E4 CHECK FOR CORRECT SJB OPERATION


- Disconnect all the SJB connectors.
- Check the connectors for:

- corrosion.
- pushed-out pins.
- spread terminals.
- Connect all the SJB connectors and make sure that they are seated correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new SJB. REFER to Multifunction Electronic Modules Service and Repair. CLEAR the DTCs. 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. CLEAR the DTCs. REPEAT the self-test.

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