GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2001 🢒 Park Avenue 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 DTC B1512-B1537

Circuit Description

The IPC monitors the driver information center (DIC) switch signal circuits in order to perform various functions. The DIC switch contains 2-5 active low momentary switches, depending on option content. The IPC detects a switch activation when the signal circuit is low.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

B1520 (w/UB7 or JH8)

The IPC detects that the RESET switch signal circuit is low for greater than 60 seconds.

B1521 (w/UB7 or JH8)

The IPC detects that the ENG/MET switch signal circuit is low for greater than 60 seconds.

B1522 (w/UB7)

The IPC detects that the FUEL INFO switch signal circuit is low for greater than 60 seconds.

B1523 (w/UB7)

The IPC detects that the GAUGE INFO switch signal circuit is low for greater than 60 seconds.

B1524 (w/UB7)

The IPC detects that the ODO TRIP switch signal circuit is low for greater than 60 seconds.

Action Taken When the DTC Sets

The IPC ignores the malfunctioning switch circuit.

Conditions for Clearing the DTC
    • The current DTC becomes history when the fault is no longer present and the ignition has been cycled OFF.
    • The IPC receives a clear code command from the scan tool.

Step

Action

Value(s)

Yes

No

Schematic Reference: Instrument Cluster Schematics

1

Did you perform the Instrument Cluster Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Instrument Cluster

2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the following parameters in the IPC inputs list:
    4. • Display Odometer Switch (w/UB7)
    • Display Gage Switch (w/UB7)
    • Display Fuel Switch (w/UB7)
    • English/Metric Switch (w/UB7 or JH8)
    • Reset Switch (w/UB7 or JH8)

Does the scan tool display Off for all parameters?

--

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

Go to Step 3

3
  1. Turn OFF the ignition.
  2. Disconnect the driver information center (DIC) switch.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the suspect switch parameter that displayed On.

Does the scan tool display Off?

--

Go to Step 6

Go to Step 4

4

Test the signal circuit of the suspect 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 9

Go to Step 5

5

Inspect for poor connections at the harness connector of the IPC. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 9

Go to Step 7

6

Inspect for poor connections at the harness connector of the DIC switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 9

Go to Step 8

7

Replace the IPC. Refer to Instrument Cluster Replacement .

Did you complete the replacement?

--

Go to Step 9

--

8

Replace the DIC switch. Refer to Driver Information Display Switch Replacement .

Did you complete the replacement?

--

Go to Step 9

--

9
  1. Use the scan tool in order to clear the DTCs.
  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