B1423

DTC B1423

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.



DTC Descriptors
DTC B1423 03
- Control Module Power and Ground Circuits Voltage Below Threshold

DTC B1423 07
- Control Module Power and Ground Circuits Voltage Above Threshold




Diagnostic Fault Information






Circuit/System Description

The radio monitors the battery voltage through the battery positive voltage circuits.


Conditions for Running the DTC

* The voltages supplied to the control modules are in the range of 8.5-17 V.
* The ignition is ON.



Conditions for Setting the DTC

B1423 03

The radio detects a system voltage below 8.5 V for 5 seconds.

B1423 07

The radio detects a system voltage above 17 V for 5 seconds.


Action Taken When the DTC Sets

* The radio immediately disables all outputs when an out of range voltage condition has been detected.
* All radio functions are disabled.



Conditions for Clearing the DTC

The DTC clears after 50 malfunction-free ignition cycles.


Diagnostic Aids

* A high or low voltage DTC set in multiple modules indicates a concern in the charging system.
* A possible cause of this DTC could be overcharging with a battery charger or jump starting.
* A high or low voltage value in multiple modules indicates a concern in the charging system.
* This DTC may be an indication that the battery supply voltage to the radio was interrupted.



Reference Information
Schematic Reference

Radio/Navigation System Schematics (Radio/Navigation System Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Radio/Audio System Description and Operation (Radio/Audio System Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information


Circuit/System Verification

Engine running measure and record the voltage at the battery terminals. Verify that the battery voltage is 12.5-15.5 V.

If the battery voltage is not within the specified range, refer to Charging System Test (Charging System Test) .



Circuit/System Testing

1. Ignition OFF, disconnect the X2 harness connector at the radio.
2. Test less than 5 Ω between the ground circuit terminal 16 and ground.

• If greater than specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify a test lamp illuminates between the B+ circuits listed below and ground.

* Battery Positive Voltage terminal 10
* Battery Positive Voltage terminal 14
* Battery Positive Voltage terminal 15


• If the test lamp does not illuminate, test the appropriate B+ circuit for a short to ground or an open/high resistance.

4. If all the circuits test normal, replace the radio.



Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.


Control Module References (Programming and Relearning)for radio replacement, setup, and programming