Pinpoint Test E: SJB Will Not Enter Sensor Training Mode When Using The TPMS Sensor Training Procedure

Tire Pressure Monitoring System

Pinpoint Tests

Pinpoint Test E: SJB Will Not Enter Sensor Training Mode When Using the 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 (BPP) 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:
- Wiring, terminals or connectors
- Brake ON/OFF switch
- Ignition switch
- SJB



PINPOINT TEST E: SJB WILL 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 GEM_BOO PID (SJB reads the brake switch directly).
- 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 Lighting and Horns to continue diagnosis of the stoplamp switch.

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E2 CHECK THE SJB IGNITION SWITCH PIDs


- Monitor the following 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 (SJB reads the ignition switch directly).
- Do the ignition switch status PID values match the ignition switch positions?

Yes
GO to E3.

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

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E3 CHECK THE SJB VEHICLE SPEED (VSS_GEM) PID


- Monitor the VSS_GEM PID (SJB receives vehicle speed from the Instrument Cluster (IC)).
- Does the vehicle speed PID value match the speed of the vehicle?

Yes
GO to E4.

No
REFER to Instrument Panel, Gauges and Warning Indicators to diagnosis of the IC/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 Body Control Systems. CLEAR the DTCs. REPEAT the self-test.

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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