Diagnostic Instructions
Circuit/System Description
If the body control module (BCM) detects a low tire pressure condition or a malfunction in the system, the module will send a serial data message to the instrument cluster requesting the appropriate tire pressure monitor indicator illumination and also
to display the appropriate data message on the driver information center, if equipped. If a significantly low tire pressure is detected, the tire pressure monitor indicator is permanently ON. If the system is affected, the tire pressure monitor indicator will
flashes for 1 min and then remain illuminated after Ignition ON.
Diagnostic Aids
| • | Both the indicator icon and driver information center message can be cleared by adjusting the tire pressures to the recommended kPa/psi and driving the vehicle above 40 km/h (25 MPH) for at least 2 min. |
| • | If unsure about the condition, cycle the ignition and observe the tire pressure monitor indicator icon. If the tire pressure monitor indicator icon is continuously illuminated after the instrument cluster bulb check is completed, a low tire pressure
condition is present. Check the tires for damage or leaks and inflate to the tire placard specifications. If the tire pressure monitor indicator icon flashes for 1 min. after the instrument cluster bulb check is completed and then remains illuminated,
a tire pressure monitor system DTC is set. Perform the
Diagnostic System Check - Vehicle |
| • | Temperature can greatly affect tire pressures. Low tire pressure on a cold morning may cause the tire pressure monitor indicator icon to turn ON. The air pressure in the tire increases as the ambient temperature rises or as the tire warms up while
the vehicle is driven. The pressure may increase enough to exceed the predetermined low pressure threshold which will turn OFF the tire pressure monitor indicator icon. |
| • | Aftermarket wheel valve system locations can cause a sensor to not function correctly. |
| • | A sensor may have been damaged due to a previous wheel/tire service or flat tire event. |
| • | The use of tire sealants can obstruct the sensor pressure sensing port and cause inaccurate tire pressure readings. If this condition is verified, remove the sealer from the tire and replace the sensor.
Tire Pressure Indicator Sensor Replacement |
| • | Occasionally sensor transmissions are not received by the remote function receiver module due to vehicle level radio frequency interference from items such as, but not limited to, aftermarket ignition systems, DVD players, CB radios, or metallic
type window tinting. |
Reference Information
Schematic Reference
Tire Pressure Monitoring System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Tire Pressure Monitor Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References
Circuit/System Testing
Note: Low tire pressure in one or more tires is indicated by a continuously illuminated tire pressure monitor indicator icon after the instrument cluster bulb check is completed. If equipped with a driver information center, a check
tire pressure type message will also be displayed. It is not necessary to perform the learn procedure for a low tire condition.
When a tire pressure monitor system DTC is set, the tire pressure monitor indicator icon will flash for 1 minute
after the instrument cluster bulb check is completed and then remains illuminated. If equipped with a driver information center, a service tire monitor type message will also be displayed.
- Verify all tires are inflated to the proper pressure ±10%. Refer to
Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID Label
| ⇒ | If not within the specified range, adjust all tire pressures to specification and drive the vehicle over 40 km/h (25 mph) for greater than 2 min. Verify the tire pressure monitor indicator icon is OFF. |
- Using a scan tool, perform the Body Control Module (BCM) Tire Pressure Sensors Learn with the scan tool and cycle the ignition. Observe tire pressures in the scan tool data display. Verify the simulated tire pressures do not differ more than +/-27.6 kPa (4 psi)
of the scan tool reading.
| ⇒ | If not within the specified range, replace the K9 Body Control Module (BCM). |
- Using a scan tool, perform the instrument panel special functions All Indicators test. Command the instrument panel lamps ON and OFF. Verify the tire pressure monitor indicator icon turns ON and OFF.
| ⇒ | If the tire pressure monitor icon does not turn ON and OFF, replace the P16 Instrument Panel Cluster (IPC). |
Repair Instructions
Perform the
Diagnostic Repair Verification
Control Module References
