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 Descriptor
DTC C0914 03: Device Voltage Reference Output 1 Circuit Voltage Below ThresholdDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ | C0914 | C0914 | -- | -- |
Ground | -- | C0914 | -- | -- |
Circuit/System Description
The adaptive cruise module (ACM) monitors the system voltage to ensure that the voltage stays within the proper range. Damage to components, and incorrect data may occur when the voltage is out of range.
Conditions for Running the DTC
| • | The vehicle speed is above 8 km/h (5 mph). |
| • | The system voltage is between 9.0-18 volts. |
Conditions for Setting the DTC
The ACM detects a system voltage below 8.5 volts for 1 second.
Action Taken When the DTC Sets
| • | The ACM will command the RADAR NOT READY warning message to be illuminated on the driver information center (DIC). |
| • | The Cruise Control will be disabled. |
Conditions for Clearing the DTC
| • | The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | Using the scan tool Clear DTC Information function can clear the DTC. |
| • | The system voltage is greater than 9.0 volts. |
Reference Information
Schematic Reference
Connector End View Reference
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 12.6-15.5 volts.
- Engine running, observe the scan tool battery voltage signal parameter. The reading should be between 12.6 and 15.5 volts.
| ⇒ | If the battery voltage is not within the specified range, refer to Charging System Test |
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the adaptive cruise module (ACM).
- Ignition OFF, test for less than 3 ohms between the ground circuit terminal 12 and ground.
- Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 15 and ground.
- If all circuits test normal, test or replace the ACM.
| ⇒ | If greater than the specified value, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp did not illuminate , test the circuit for an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ACM replacement, setup, and programming
