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 B1517 03: Battery Voltage Below Threshold - BCM 12VDTC B1517 07: Battery Voltage Above Threshold - BCM 12V
DTC B1517 5A: Battery Voltage Plausibility Failure - BCM 12V
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
12V BCM B+ | B1516 08 | B1516 08 | B1517 5A | -- |
12V High Resolution B+ | B1517 03, B1517 5A | B1517 03, B1517 5A | B1517 07 | -- |
Ground | -- | B1516 08, B1517 03, B1517 5A | B1517 07 | -- |
Typical Scan Tool Data
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Ignition ON, engine OFF. Parameter Normal Value: 12.60 Volts | |||
12V BCM B+ | 25.60 Volts | 26.10 Volts | -- |
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Ignition ON, engine OFF. Parameter Normal Value: 12.600 Volts | |||
12V High Resolution B+ | 0.000 Volts | 0.000 Volts | -- |
Circuit/System Description
The body control module (BCM) has 2 circuits for monitoring vehicle 12V system voltage. The BCM B+ is supplied to terminal 3 X3 by the BCM fuse, and the high resolution B+ is supplied to the BCM terminal 10 X4 by the IPC fuse. The BCM monitors the system voltage on both circuits 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. If the BCM detects the system voltage on the high resolution B+ circuit is outside the normal range, DTC B1517 will set.
Conditions for Running the DTC
The BCM is awake.
Conditions for Setting the DTC
B1517 03
The voltage of the high resolution B+ circuit is less than 11 volts for 2 minutes.
B1517 07
The voltage of the high resolution B+ circuit is greater than 16 volts for 15 seconds.
B1517 5A
The voltage of the high resolution B+ circuit is 2 volts less than the voltage of the BCM B+ circuit for 10 seconds.
Action Taken When the DTC Sets
| • | The instrument panel cluster (IPC) illuminates the charge indicator. |
| • | The driver information center (DIC) displays the SERVICE BATTERY CHARGING SYSTEM message. |
Conditions for Clearing the DTC
| • | The DTC will pass when the battery voltage is in the normal range for 15 seconds. |
| • | A history DTC will clear after 50 consecutive ignition cycles have occurred without a malfunction. |
| • | The charge indicator and DIC message will remain ON until the DTC is cleared. |
Diagnostic Aids
| • | A high or low voltage DTC in multiple modules indicates a concern in the 12V charging system. |
| • | Verify that the ground connections G103 and G201 are clean and tight. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Charging System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Engine running, accessories OFF, measure and record the battery voltage at the 12V battery terminals. The voltage should be between 12.6 and 15.0 volts.
- Observe the scan tool BCM Battery Voltage parameter and the Batt. Voltage High Res. parameter. Both readings should be between 12.60 and 15.00 volts.
| ⇒ | If not within the specified range, refer to Charging System Test . |
Circuit/System Testing
- Ignition OFF, disconnect the harness connectors at the BCM.
- Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the following ground circuit terminals and ground:
- Ignition ON, verify that a test lamp illuminates between the following 12V B+ circuit terminals and ground:
- If all circuits test normal, replace the BCM.
| • | Terminal 1 X3 |
| • | Terminal 5 X3 |
| • | Terminal 9 X4 |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| • | BCM B+ terminal 3 X3 |
| • | High resolution B+ terminal 10 X4 |
| ⇒ | If the test lamp does not illuminate, test the appropriate 12V 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 BCM replacement, setup, and programming.
