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 B1423 03: Control Module Power and Ground Circuits Voltage Below ThresholdDTC B1423 07: Control Module Power and Ground Circuits Voltage Above Threshold
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ | B1423 03 | B1423 03 | -- | -- |
Ground | -- | B1423 03 | -- | -- |
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
Connector End View Reference
Description and Operation
Radio/Audio System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References 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. |
Circuit/System Testing
- Ignition OFF, disconnect the X2 harness connector at the radio.
- Test less than 5 Ω between the ground circuit terminal 16 and ground.
- Ignition ON, verify a test lamp illuminates between the B+ circuits listed below and ground.
- If all the circuits test normal, replace the radio.
| ⇒ | If greater than specified range, test the ground circuit for an open/high resistance. |
| • | 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. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for radio replacement, setup, and programming
