Table of Contents
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1J-21 Charging System:
Step
Schematic Reference:"Starting and Charging Schematics: " or "Power Distribution Schematics: " and "Body Control
System Schematics: "
Connector End View Reference:"Master Electrical Component List: "
Did you perform the Diagnostic System Check -
Vehicle?
1
1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool, observe the Battery Voltage
2
parameters in the body control module (BCM) data
list.
Do any of the voltages differ more than the specified
value?
1. Turn OFF the ignition.
2. Disconnect the BCM harness connectors.
3. Turn ON the ignition, with the engine OFF.
3
4. Measure the voltage between the battery positive
voltage circuits of the BCM and the ground circuits of
the BCM.
Do the voltages differ more than the specified value?
Measure the voltage from the battery positive voltage
4
circuits of the BCM and a good ground.
Do the voltages differ more than the specified value?
1. Turn ON the ignition.
2. Measure the voltage between the battery positive
5
voltage circuits of the BCM and the ground circuits of
the BCM.
Does the voltage measure within the specified range?
Measure the voltage between the battery positive
6
voltage circuits of BCM and a good ground.
Does the voltage measure within the specified range?
Test the battery positive voltage circuits of BCM for a
high resistance or an open. Refer to "Circuit Testing: "
7
and "Wiring Repairs: ".
Did you find and correct the condition?
Test the ground circuits of the BCM for a high resistance
or an open. Refer to "Circuit Testing: " and "Wiring
8
Repairs: ".
Did you find and correct the condition?
Inspect for poor connections at the harness connector of
the BCM. Refer to "Testing for Intermittent Conditions
9
and Poor Connections: " and "Connector Repairs: ".
Did you find and correct the condition?
Replace the module BCM. Refer to "Control Module
10
References: " for replacement, setup, and programming.
Did you complete the replacement?
1. Use the scan tool in order to clear the DTCs.
2. Operate the vehicle within the Conditions for
11
Running the DTC as specified in the supporting text.
Does the DTC reset?
Action
Value(s)
Yes
—
Go to Step 2
2 V
Go to Step 5
2 V
Go to Step 9
2 V
Go to Step 8
10.5-15.5 V
Go to Step 9
10.5-15.5 V
Go to Step 8
—
Go to Step 11
—
Go to Step 11
—
Go to Step 11
—
Go to Step 11
—
Go to Step 2
No
Go to
"Diagnostic
System Check -
Vehicle
Diagnostic
Information: "
Go to Step 3
Go to Step 4
Go to Step 7
Go to Step 6
Go to Step 7
Go to Step 9
Go to Step 9
Go to Step 10
—
System OK
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Table of Contents
Troubleshooting
