For 1990-2009 cars only
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC B1449 03: Remote Device Voltage Below ThresholdDTC B1449 07: Remote Device Voltage Above Threshold
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Infrared Module Voltage Signal | B1449 03 | B1449 03 | B1449 07 | -- |
Circuit/System Description
The infrared module is supplied with 10.5 volts from the rear audio/HVAC module when the rear audio system is active.
Conditions for Running the DTC
| • | Ignition ON. |
| • | Battery voltage must be between 9-16 volts. |
Conditions for Setting the DTC
The module detects a short to voltage, short to ground, or an open/high resistance in the infrared module voltage signal circuit.
Action Taken When the DTC Sets
The rear audio/HVAC module sets the DTC and the infrared module will be disabled.
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists. |
| • | A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Video Entertainment System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the video display.
- Ignition OFF, test for less than 5.0 ohms between the ground circuit terminals listed below and ground.
- Ignition ON, rear audio ON, test for 10.0-11.0 volts between the supply voltage circuit terminal 15 and ground.
- If all circuits test normal, replace the video display.
| • | Terminal 6 |
| • | Terminal 14 |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If less than the specified range, test the voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the rear audio/HVAC module. |
| ⇒ | If greater than the specified range, test the voltage supply circuit for a short to voltage. If the circuit tests normal, replace the rear audio/HVAC module. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for Rear Audio/HVAC Module replacement, setup, and programming
