Diagnostic System Check - Instrument Cluster. GMC Truck Jimmy

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 1999 🢒 Jimmy - 2WD 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 Diagnostic System Check - Instrument Cluster

Instrument Cluster Components
Cell 81: RDO BATT Fuse, Power
Cell 51: Power and Ground
Cell 10: AUX PWR, RDO BATT and HDLP SW Fuses
Handling ESD Sensitive Parts Notice
Cell 50: Class 2 Communication (2.2L)
Cell 14: Body Relay Block and Underhood Fuse Block
Cell 14: Body Relay Block and Underhood Fuse Block
Cell 14: G103 and G105 (2.2L)
Cell 14: G103 and G105 (2.2L)

Circuit Description

The IPC monitors the Class 2 messages and compares them to the inputs from the various sensors and gauges. The cluster also monitors the ignition switch position based on the ignition signal inputs. The cluster has a built in microprocessor. The microprocessor performs a self test on power up.

Conditions for Clearing the MIL/DTC

•	A history diagnostic trouble code (DTC) will clear after 100 consecutive ignition cycles without a fault present.

•	Use a scan tool in order to clear the history and current DTC(s).

Diagnostic Aids

•	Verify that the following fuses are OK:

-	RADIO BATT

CLUSTER

-	ILLUMINATION

GAUGES

•	The IPC performs a self-check on power up. Turn the ignition switch to the RUN position and observe the conditions listed in the Cluster Power-up Function Check Table.

•	A scan tool reads Class 2 messages with the ignition switch in the RUN position.

•	Use a scan tool in order to test for DTCs.

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

This step inspects the IPC's circuits for power and ground.

This step inpects the integrity of the Class 2 bus and all of the associated modules.

This is the IPC self test.

This step checks the operation of the PRNDL.

Step

Action

Value(s)

Yes

Inspect all IPC power and ground feeds. Refer to Instrument Cluster System Check .

Is the diagnostic test complete?

Go to Step 2

Attempt to establish communications with all of the following Class 2 modules:

•

IPC

•

VCM/PCM

•

BCM

•

ABS

Turn the ignition switch to RUN.
Enter the appropriate model year and vehicle type using the scan tool.
Select the following selections:

4.1.	Diagnostics

4.2.	Diagnostic Circuit Check

4.3.	Class 2 Message Monitor

Record all modules that are communicating.
Compare the list of modules that are communicating to the schematic showing which modules are connected to terminal 2 (Class 2 serial data link) of the DLC.

Are any of the modules on the Class 2 serial data link not communicating?

Go to Step 3

Go to Diagnostic System Check - Data Link Communications in Data Link Communications

Important: Do not start the engine or move the automatic transmission shifter from the PARK position.

Turn the ignition switch to the RUN position.
Observe the IPC for the following power-up indications:

•	The Odometer display will perform a 2 second segment function test.

•	The following indicators will illuminate for 3 seconds:

ABS

Low Fuel

-	Check Gauges

-	Overspeed (export only)

Brake

•	The PRNDL (automatic transmission) will display P (park position).

•	The battery will illuminate.

•	The seat belt indicator will illuminate for 20 seconds and continue to flash for 55 seconds (controlled by the BCM).

•	The SES will illuminate continuously (controlled by the VCM/PCM). The Air bag indicator will flash 7 times (controlled by the SDM).

•	Refer to Cluster Power-Up Function Check.

Are the power-up indications correct?

Go to Step 4

Go to Applicable Diagnostic Table

Move the shift lever through each of the shift positions with the engine running and the brake firmly applied.
Observe the PRNDL indicator.

Does the indicator correspond to the shift lever positions?

Go to Step 5

Go to Functional Test in Automatic Transmission

Inspect for DTCs with the scan tool.

Are any DTCs present?

Go to Applicable Diagnostic Table

Go to Instrument Cluster System Check