Circuit Description
The BCM monitors the battery positive voltage and battery negative circuit voltage to determine if it is between 9.0-15.0 volts and sends this information out as a class 2 message to the IRC, SIR and RFA.
On Star (ONS) also monitors the battery positive voltage and battery negative circuit voltage to determine if it is between 9.0-15.0 volts.
Conditions for Running the DTC
This DTC shall run only if the BCM or ONS have power, ground and the ignition in not in START mode.
Conditions for Setting the DTC
This DTC shall be set as current when the voltage falls below 9.0 volts for 1.2 milliseconds.
Action Taken When the DTC Sets
A message shall be sent out on the class 2 lines to illuminate the charge indicator and security lamp.
Conditions for Clearing the MIL/DTC
In order to clear the DTC from a current status the voltage shall be greater than 9.54 volts for 1200 milliseconds.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Engine Electrical Diagnostic System Check? | -- | Go to Step 2 | |
2 | Is DTC B1327 current in more than 1 module? | -- | Go to Step 3 | Go to Step 4 |
3 |
Does the scan tool indicate the battery voltage is greater than the specified value? | 9.0 V | Go to Step 10 | Go to Charging System Test |
4 |
Does the scan tool indicate the battery voltage is greater than the specified value? | 9.0 V | Go to Step 5 | Go to Charging System Test |
5 |
Does the voltage measure near the specified value? | battery voltage | Go to Step 9 | Go to Step 6 |
6 | Measure the voltage between the battery positive voltage circuit of the affected module and a good ground. Does the voltage measure near the specified value? | battery voltage | Go to Step 7 | Go to Step 8 |
7 | Test the ground circuit of the affected module for a high resistance or open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 9 |
8 | Test the battery positive voltage circuit of the affected module for a high resistance or open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 9 |
9 | Inspect for poor connections at the harness connector of the affected module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 10 |
10 | Replace the affected module. Refer to Control Module References in Body Control System. Did you complete the replacement? | -- | Go to Step 11 | -- |
11 |
Does the DTC reset? | -- | Go to Step 3 | System OK |
