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

Tire Pressure Monitoring System (TPMS)

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

Normal Operation

For the Smart Junction Box (SJB) to enter Tire Pressure Monitoring System (TPMS) sensor training mode, the SJB (Smart Junction Box) must receive valid inputs from the brake ON/OFF 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]) from the Instrument Cluster (IC). Refer to 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 (Smart Junction Box)

PINPOINT TEST E : SMART JUNCTION BOX (SJB) WILL NOT ENTER SENSOR TRAINING MODE WHEN USING THE TIRE PRESSURE MONITORING SYSTEM (TPMS) SENSOR TRAINING PROCEDURE

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

- Connect the scan tool.

- Ignition ON.

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

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

E2 CHECK THE SJB (Smart Junction Box) 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 (Smart Junction Box) 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.

E3 CHECK THE SJB (Smart Junction Box) VEHICLE SPEED SENSOR (VSS_GEM) PID

- Monitor the VSS_GEM PID (SJB (Smart Junction Box) receives vehicle speed from the IC (Instrument Cluster)).

Is the vehicle speed less than 5 km/h (3 mph)?

Yes
GO to E4.

No
REFER to Instrument Panel, Gauges and Warning Indicators to continue diagnosis of the IC (Instrument Cluster) /vehicle speed concern.

E4 CHECK FOR CORRECT SJB (Smart Junction Box) OPERATION

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

- Check the connectors for:
- corrosion.
- pushed-out pins.
- spread terminals.


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