GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2005 🢒 Bonneville 🢒 Restraints 🢒 SIR 🢒 DTC B2818

Circuit Description

The instrument panel cluster (IPC) monitors the tire press reset switch, with systems monitor, or the driver information center (DIC) reset switch signal circuit, with DIC. If the IPC detects a ground on either reset switch signal circuit for more than a predetermined amount of time, a malfunction is detected.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B2818 TPM Reset Malfunction

Conditions for Running the DTC
    • The ignition is ON.
    • Ignition voltage is 10.5-14.7.

Conditions for Setting the DTC

The IPC detects a ground on the tire press reset switch signal circuit, or the DIC reset switch signal circuit for more than 15 continuous seconds.

Action Taken When the DTC Sets
    • DTC B2818 is stored in memory.
    • The IPC ignores the reset switch signal circuit input.

Conditions for Clearing the MIL/DTC
    • A current DTC will clear on the next consecutive malfunction-free ignition cycle.
    • A history DTC will clear after 100 consecutive malfunction-free ignition cycles.

Diagnostic Aids

The IPC disables the reset switch input when a malfunction is detected making the switch status unknown when viewing the reset switch parameter on the scan tool. If an intermittent malfunction is suspected, cycle the ignition after repositioning wires and connectors to verify correct switch status.

Test Description

The number below refers to the step number on the diagnostic table.

  1. This step tests if the malfunction is in the reset switch.

Step

Action

Yes

No

Schematic Reference: Tire Pressure Monitoring System Schematics

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2
  1. Turn ON the ignition, with the engine OFF.
  2. With a scan tool, select the BCM Diagnostic Trouble Codes (DTC) function.

Does the scan tool display DTC B2818 as current?

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

3

  1. Turn OFF the ignition.
  2. Disconnect the reset switch.
  3. Turn ON the ignition, with the engine OFF
  4. With the scan tool, observe the Tire Reset Switch, w/Systems Monitor, or the DIC Reset Button, w/DIC, data parameter in the IPC Data list.

Does the scan tool display OFF?

Go to Step 6

Go to Step 4

4

Test the signal circuit of the reset switch for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 7

Go to Step 5

5

Replace the instrument panel cluster (IPC). Refer to Instrument Cluster Replacement in Instrument Panel, Gages, and Console.

Did you complete the replacement?

Go to Step 7

--

6

Replace the reset switch. Refer to Driver Information Display Switch Replacement in Instrument Panel, Gages, and Console.

Did you complete the replacement?

Go to Step 7

--

7
  1. Use the scan tool in order to clear the DTC.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK