B2872
Tire Pressure Monitoring System (TPMS)
Pinpoint Test F: TPMS (Tire Pressure Monitoring System) Indicator FLASHES for 70 Seconds and Then Remains ON Solid When the Ignition Key is Turned to the ON Position, the Message Center (if equipped) Displays TIRE PRESSURE SENSOR or MONITOR FAULT and DTC B2872 or B287A is Present
Normal Operation
If there is a fault with 1, 2 or 3 of the Tire Pressure Monitoring System (TPMS) sensors, DTC B2872 sets. The TPMS (Tire Pressure Monitoring System) warning indicator flashes for 70 seconds and then remains ON continuously when the ignition switch is turned to the ON position and the message center (if equipped) displays TIRE PRESSURE SENSOR FAULT.
If the Smart Junction Box (SJB) does not get a response from all 4 of the TPMS (Tire Pressure Monitoring System) sensors, DTC B287A sets and the message center (if equipped) displays TIRE PRESSURE MONITOR FAULT.
It should be noted that TPMS (Tire Pressure Monitoring System) communication can be interrupted by Radio Frequency Interference (RFI), which can cause intermittent issues. RFI (Radio Frequency Interference) is generated by electrical motors and appliance operation, cellular telephones, remote transmitters, power inverters and portable entertainment equipment. Anytime the TPMS (Tire Pressure Monitoring System) sensor training procedure is performed successfully, the warning indicator is extinguished and the vehicle must be driven for 18-20 minutes before the SJB (Smart Junction Box) initiates a self test to verify system operation.
- DTC B2872 (Tire Pressure Sensor Fault)- set by the SJB (Smart Junction Box) when 1, 2 or 3 of the tire pressure sensors are faulted, not responding or when data is not received by the SJB (Smart Junction Box).
- DTC B287A (Tire Pressure Monitor Fault)- When all 4 of the tire pressure sensors are faulted, not responding or when data is not received by the SJB (Smart Junction Box).
- TP_STAT PID = SYSTEM FAULT is displayed if the SJB (Smart Junction Box) does not receive a signal transmission from all 4 TPMS (Tire Pressure Monitoring System) sensors for 20 minutes and the vehicle speed is above 32 km/h (20 mph).
- TP_STAT PID = SENSOR FAULT is displayed if the SJB (Smart Junction Box) does not receive a signal transmission from 1, 2, or 3 TPMS (Tire Pressure Monitoring System) sensors for 20 minutes and the vehicle speed is above 32 km/h (20 mph).
This pinpoint test is intended to diagnose the following:
- Intermittent TPMS (Tire Pressure Monitoring System) operation due to RFI (Radio Frequency Interference)
- TPMS (Tire Pressure Monitoring System) sensor(s) not trained
- Not all TPMS (Tire Pressure Monitoring System) sensors are installed
- TPMS (Tire Pressure Monitoring System) sensor(s)
- SJB (Smart Junction Box)
PINPOINT TEST F : TPMS (Tire Pressure Monitoring System) INDICATOR FLASHES FOR 70 SECONDS AND THEN REMAINS ON SOLID WHEN THE IGNITION KEY IS TURNED TO THE ON POSITION, THE MESSAGE CENTER (IF EQUIPPED) DISPLAYS TIRE PRESSURE SENSOR OR MONITOR FAULT AND DTC B2872 OR B287A IS PRESENT
F1 CHECK THE HORN OPERATION
- Press the steering wheel horn pad for 2 seconds.
Does the horn sound?
Yes
GO to F2.
No
For horn diagnosis, REFER to Horn.
F2 CHECK THE TPMS (Tire Pressure Monitoring System) STATUS (TP_STAT) PID
NOTE: Make sure that all aftermarket electronic equipment has been disconnected (if possible) and that the customer has been questioned about the kinds of electronic equipment they may have been using in the vehicle when this issue was identified.
- Connect the scan tool. NOTE: A spare tire cannot be programmed to the vehicle, even if equipped with a TPMS (Tire Pressure Monitoring System) sensor. If a damaged road wheel is located in the trunk and the SJB (Smart Junction Box) cannot communicate with it, or if the damaged wheel has been dropped off at a dealership or repair shop, the SJB (Smart Junction Box) sets a TPMS (Tire Pressure Monitoring System) sensor fault.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger- SJB (Smart Junction Box).
- Monitor the TP_STAT PID.
Does the PID display SENSOR FAULT?
Yes
GO to F3.
No
If the TP_STAT PID displays SYSTEM FAULT, GO to F5.
F3 CARRY OUT THE SENSOR TRAINING PROCEDURE
- Train all 4 tire pressure sensors. Refer to Tire Pressure Monitoring System (TPMS) Sensor Training .
Did all of the tire pressure sensors transmit correctly and did the horn sound when each TPMS (Tire Pressure Monitoring System) sensor transmitted to the SJB (Smart Junction Box) ?
Yes
The system is operating correctly at this time. The concern may have been caused by RFI (Radio Frequency Interference). CLEAR the DTCs. REPEAT the self-test. TEST for normal operation. REFER to PID Definitions and Intermittent Troubleshooting for information on locating sources of RFI (Radio Frequency Interference) Principles Of Operation.
No
GO to F4.
F4 CHECK FOR CORRECT TPMS (Tire Pressure Monitoring System) OPERATION
- Move the vehicle to rotate the wheels at least one-fourth of a turn. Leave the vehicle doors open. Start the sensor training procedure at a different wheel.
- Train all 4 tire pressure sensors. Refer to Tire Pressure Monitoring System (TPMS) Sensor Training .
Did any of the tire pressure sensors transmit correctly and did the horn sound when each TPMS (Tire Pressure Monitoring System) sensor transmitted to the SJB (Smart Junction Box) ?
Yes
If some of the TPMS (Tire Pressure Monitoring System) sensors trained, INSTALL a new TPMS (Tire Pressure Monitoring System) sensor for the TPMS (Tire Pressure Monitoring System) sensor(s) that failed to train. REFER to Wheel and Tire . If all of the TPMS (Tire Pressure Monitoring System) sensors trained, the concern may have been cause by RFI (Radio Frequency Interference). CLEAR the DTCs.
REPEAT the self-test. TEST for normal operation. REFER to PID Definitions and Intermittent Troubleshooting for information on locating sources of RFI (Radio Frequency Interference) Principles Of Operation.
No
GO to F5.
F5 CHECK FOR CORRECT SJB (Smart Junction Box) OPERATION
- Disconnect all the SJB (Smart Junction Box) electrical connectors.
- Check the connectors for:
- corrosion
- pushed-out pins
- bent 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
NOTE: The sensors may not be present. DISMOUNT the tire. REFER to Wheel and Tire . VERIFY the sensors are present and mounted to the wheels. If missing, INSTALL new sensors.
If the sensors are present, 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.