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B361B




DTC B361B
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Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B361B 02
- Head-Up Display Switch Short to Ground

DTC B361B 05
- Head-Up Display Switch High Voltage/Open

DTC B361B 59
- Head-Up Display Switch Protection Time-Out

Diagnostic Fault Information






Circuit/System Description

The head-up display switch is a multiplexed switch that controls the head-up display based on driver inputs. The head-up display provides the switch with a low reference and monitors a signal circuit. The head-up display switch is made up of a resistor ladder and three switches: Dim +/-, Up/Down, and Page. When a switch is pressed, the signal voltage is pulled low through the resistor ladder. When pressed, each of the switches will result in a different signal voltage seen by the head-up display, depending on the switch's location on the resistor ladder.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

B361B 02

The head-up display switch signal voltage is less than 1 V

B361B 05

The head-up display switch signal voltage is greater than 11.5 V

B361B 59

The head-up display switch is stuck

Action Taken When the DTC Sets

The head-up display ignores the head-up display switch inputs

Conditions for Clearing the DTC

The DTC will become history if the head-up display no longer detects a malfunction

Reference Information

Schematic Reference

Head-Up Display Schematics Head-Up Display Schematics

Connector End View Reference

Component Connector End Views Fuel Pump and Level Sensor Assembly

Description and Operation

Instrument Cluster Description and Operation Instrument Cluster

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON.

2. While holding each switch listed below, verify the scan tool Heads Up Display Switch State parameter is as follows:

* Dim + - HUD Dimming Up/Down Pressed

* Dim - - HUD Dimming Up/Down Pressed

* Up - HUD Movement

* Down - HUD Movement

* Page - HUD Page Switch

If the scan tool parameter does not equal the expected result with the switch in the appropriate state
Refer to Circuit/System Testing.

If the scan tool parameter equals the expected result with the switch in the appropriate state

3. All OK.

Circuit/System Testing

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S27 head-up display switch. It may take up to 2 minutes for all vehicle systems to power down.

2. Test for less than 10 ohms between the low reference circuit terminal 3 and ground.

If 10 ohms or greater

1. Ignition OFF, disconnect the harness connector at the P29 head-up display.

2. Test for less than 2 ohms in the low reference circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.

If less than 2 ohms, replace the P29 head-up display.

If less than 10 ohms

3. Test for less than 1 V between the signal circuit terminal 4 and ground.

If 1 V or greater

1. Ignition OFF, disconnect the harness connector at the P29 head-up display.

2. Test for less than 1 V between the signal circuit and ground.

If 1 V or greater, repair the short to voltage in the circuit.

If less than 1 V, replace the P29 head-up display.

If less than 1 V

4. Ignition ON.

5. Test for B+ between the signal circuit terminal 4 and ground.

If less than B+

1. Ignition OFF, disconnect the harness connector at the P29 head-up display.

2. Test for infinite resistance between the signal circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.

If infinite resistance

3. Test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.

If less than 2 ohms, replace the P29 head-up display.

If B+

6. Test or replace the S27 head-up display switch.

Component Testing

1. Ignition OFF, disconnect the harness connector at the S27 head-up display switch.

2. Test for 3.4K - 4.2K ohms between the signal terminal 4 and the low reference terminal 3.

If not between 3.4K - 4.2K ohms
Replace the S27 head-up display switch.

If between 3.4K - 4.2K ohms

3. Test for 87 - 107 ohms between the signal terminal 4 and the low reference terminal 3 with the Dim + switch pressed.

If not between 87 - 107 ohms
Replace the S27 head-up display switch.

If between 87 - 107 ohms

4. Test for 291 - 356 ohms between the signal terminal 4 and the low reference terminal 3 with the Dim - switch pressed.

If not between 291 - 356 ohms
Replace the S27 head-up display switch.

If between 291 - 356 ohms

5. Test for 575 - 704 ohms between the signal terminal 4 and the low reference terminal 3 with the Up switch pressed.

If not between 575 - 704 ohms
Replace the S27 head-up display switch.

If between 575 - 704 ohms

6. Test for 1K - 1.2K ohms between the signal terminal 4 and the low reference terminal 3 with the Down switch pressed.

If not between 1K - 1.2K ohms
Replace the S27 head-up display switch.

If between 1K - 1.2K ohms

7. Test for 1.7K - 2.1K ohms between the signal terminal 4 and the low reference terminal 3 with the Page switch pressed.

If not between 1.7K - 2.1K ohms
Replace the S27 head-up display switch.

If between 1.7K - 2.1K ohms

8. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

Control Module References Control Module References for head-up display replacement, programming, and setup