Circuit Description
The instrument panel cluster (IPC) turns the LOW TIRE Indicator ON for approximately 3 seconds when the ignition switch is turned to the RUN position during the IPC bulb check. If the EBCM/EBTCM sets a Diagnostic Trouble Code (DTC), the EBCM/EBTCM sends a class 2 message to the IPC commanding the LOW TIRE Indicator ON.
Diagnostic Aids
| • | Perform a thorough inspection of the wiring and connectors. Failure to carefully and fully inspect the wiring and the connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction. |
| • | Thoroughly inspect any circuitry that may be causing the complaint for the following conditions: |
| - | Backed out terminals |
| - | Improper mating |
| - | Broken locks |
| - | Improperly formed or damaged terminals |
| - | Poor terminal-to-wiring connections |
| - | Physical damage to the wiring harness |
| • | The following conditions may cause an intermittent malfunction: |
| - | A poor connection |
| - | Rubbed-through wire insulation |
| - | A broken wire inside the insulation |
| • | If an intermittent malfunction exists refer to Intermittents and Poor Connections Diagnosis in Wiring Systems. |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
DEFINITION: LOW TIRE Indicator does not turn off after the Instrument Panel Cluster (IPC) bulb check. | ||||
1 |
Does the LOW TIRE indicator turn off? | -- | Go to Step 2 | Go to Step 3 |
2 | Refer to Tire Inflation Monitoring System Description for additional information regarding operation of the Tire Pressure Monitoring System. Is the action complete? | -- | System OK | -- |
3 | Using a Scan Tool, check for ABS Diagnostic Trouble Code (DTC) C1245 in the Electronic Brake Control Module/Electronic Brake Traction Control Module (EBCM/EBTCM). Is DTC C1245 set as a DTC? | -- | Go to Step 5 | Go to Step 4 |
4 | Suspect the Instrument Panel. Refer to Diagnostic System Check - Instrument Cluster in Instrument Panel, Gauges and Console. Is the repair complete? | -- | -- | |
5 | Using a Scan Tool, check for Body Control Module (BCM) DTC. Are any BCM DTC(s) set? | -- | Go to Step 6 | Go to Step 7 |
6 | Go to Diagnostic Trouble Code (DTC) List/Type in Body Control System. Is the repair complete? | -- | System OK | -- |
7 | Using the Scan Tool, monitor the BCM inputs. Does it show ACTIVE when pressing the TIRE RESET switch? | -- | Go to Step 8 | Go to Step 9 |
8 | Go to DTC C1245 Low Tire Pressure Detected in Antilock Brakes. Is the repair complete? | -- | System OK | -- |
9 |
Is the voltage within the values? | Released: B+ Pressed: < 2V | Go to Step 10 | Go to Step 11 |
10 | Go to Diagnostic System Check - Body Control System in Body Control System. Is the repair complete? | -- | System OK | -- |
11 |
Is the voltage B+? | -- | Go to Step 12 | Go to Step 13 |
12 | Replace the TIRE RESET switch. Is the repair complete? | -- | System OK | -- |
13 | Using a DMM, measure the voltage between the TIRE RESET switch terminal K2 and ground. Is the voltage B+? | -- | Go to Step 14 | Go to Step 15 |
14 | Repair an open in circuit 1550 between terminal K1 of TIRE RESET switch and splice S211. Is the repair complete? | -- | System OK | -- |
15 | Repair an open in circuit 1055 between terminal K2 and BCM terminal C10 connector C1. Is the repair complete? | -- | System OK | -- |
