Chevrolet Cobalt Service & Repair Manual: Tire Pressure Monitor Lamp, Diagnosis

Chevrolet Cobalt Service & Repair Manual / Electrical / Component Replacement / Tire Pressure Monitor Lamp, Diagnosis

A visual inspection must always be performed to confirm the presence of aftermarket components, potential collision damage, or areas of concern.

The Body Control Module (BCM) receives a Radio Frequency (RF) transmission from each tire pressure sensor. Each sensor has its own unique identification code, which it transmits as a portion of each RF message, that must be learned into the BCM memory. Once all IDs have been learned and vehicle speed is greater than 25 mph, the BCM continuously compares IDs in received transmission to its learned IDs to determine if all sensors are present. If the BCM detects a low tire pressure condition or a fault in the system, it will send a serial data message to the instrument panel cluster requesting the appropriate tire pressure monitor indicator illumination and also to display the appropriate data message on the driver information center, if equipped.

1.	Understand and validate customer concern. Inspect visible system components for obvious damage or conditions that may cause concern.

2.	Inspect for related bulletins, recall/field actions and preliminary information.

3.	Verify symptom is not exclusively a mechanical concern.

4.	Connect a suitably programmed scan tool, perform Vehicle DTC Information function and verify at least one control module communicates with scan tool.

5.	Verify there are no control module Internal hardware performance DTCs set.

6.	Ignition ON, command MIL ON and OFF with scan tool. MIL should turn ON and OFF as commanded.

7.	Ignition ON, command MIL ON and OFF with a scan tool while observing following control circuit status parameters:

MIL control circuit low voltage test status.

MIL control circuit open test status.

MIL control circuit high voltage test status.

Each parameter should toggle between OK and Not Run or Not Run and OK.

If unsure about condition, cycle ignition and observe tire pressure monitor indicator icon. If tire pressure monitor indicator icon is continuously illuminated after IPC bulb inspection is completed, a low tire pressure condition is present. Inspect tires for damage or leaks and inflate to tire placard specifications.

9.	If tire pressure monitor indicator icon flashes for one minute after IPC bulb inspection is completed and remains illuminated, a tire pressure monitor system DTC is set.

10.	Non-approved tire sealants can obstruct sensor pressure sensing port and cause inaccurate tire pressure readings. If this condition is verified, remove sealer from tire and replace sensor.

11.	Aftermarket wheel value stem locations can cause a sensor to not function correctly.

12.	Occasionally sensor transmissions are not received by BCM due to vehicle level RF interference from items such as but not limited to aftermarket ignition systems, DVD players, CB radios, or metallic type window tinting.

13.	Occasionally sensors can become mislocated due to previous tire rotations where sensor learn procedure was not performed or stray sensor transmissions have been received from other vehicles. Always learn sensors to ensure DTC set is for that actual physical corner of vehicle.

Tail Lamp Bulb, Replace

Coupe 1. Remove tail lamp. 2. Pull stop, tail and turn signal bulb (1) straight from socket to remove, Fig. 1. 3. ...

Transmission Control Position Indicator Bulb, Replace

1. Remove front floor console as outlined in "Floor Console." 2. Disconnect transmission floor shift control indicator la ...

Chevrolet Cobalt Service & Repair Manual: Tire Pressure Monitor Lamp, Diagnosis

Tail Lamp Bulb, Replace

Transmission Control Position Indicator Bulb, Replace

See also:

Chevrolet Cobalt Owners Manual

Chevrolet Cobalt Service Manual