Step
| Action
| Value(s)
| Yes
| No
|
1
| Did you perform the
Charging System Check
?
| --
|
Go to Step 2
| Go to
Charging System Check
|
2
|
- Connect a scan tool to the data link connector (DLC).
- Turn the ignition switch to RUN.
- Start the engine.
- Using the scan tool, monitor system voltage.
Is the measured voltage in the specified range?
| Greater than
10.6V
|
Go to Step 3
| Go to
Battery Is Undercharged or Overcharged
|
3
|
- Turn the ignition switch to OFF.
- Turn the ignition switch to RUN.
Did the charge indicator turn on, then turn off after the normal bulb
check?
| --
|
Go to Step 4
|
Go to Step 11
|
4
| Is the vehicle a Buick?
| --
|
Go to Step 13
|
Go to Step 5
|
5
|
- Turn the ignition switch to RUN.
- Start the engine and keep the engine running at fast idle.
- Disconnect the battery thermistor connector, located near the
battery.
- Using a J 39200
digital multimeter (DMM) set to DC volts scale, measure the voltage across
the battery terminals.
Is the measured voltage in the specified range?
| 13-16V
|
Go to Step 10
|
Go to Step 11
|
6
|
- Turn the ignition switch to OFF.
- Using a DMM set to DC volts scale, measure the voltage at battery
thermistor connector terminal A (body harness side).
Is the measured voltage in the specified range?
| 10-15V
|
Go to Step 8
|
Go to Step 7
|
7
|
- Check the BATT THER fuse for an open.
- If the fuse is open, repair CKT 540 (ORN) short to ground.
- If the fuse is OK, repair open or high resistance in CKT 540 (ORN).
Is the repair complete?
| --
|
Go to Step 18
| --
|
8
|
- Disconnect the generator connector.
- Connect a fused jumper from generator harness connector terminal
S to ground.
- Connect a DMM set to ohms scale between the battery thermistor
connector terminal B (body harness side) and ground.
Is the measured resistance in the specified range?
| Less than 5ohms
|
Go to Step 10
|
Go to Step 9
|
9
| Repair high resistance or open
in CKT 725 (LT BLU).
Is the repair complete?
| --
|
Go to Step 18
| --
|
10
|
- Check the battery thermistor connector for poor terminal contact.
- If OK, replace the battery thermistor.
Is the repair complete?
| --
|
Go to Step 18
| --
|
11
|
- Turn the ignition switch to LOCK.
- Disconnect the powertrain control module (PCM) connector C2.
- Turn the ignition switch to RUN.
Did the charge indicator remain on after the normal bulb check?
| --
|
Go to Step 12
|
Go to Step 13
|
12
| Replace the instrument cluster.
Refer to
Instrument Cluster Replacement
in Instrument Panel, Gauges and Console.
Is the repair complete?
| --
|
Go to Step 18
| --
|
13
| Check CKT 225 (RED) for an open or short to ground.
Is the circuit OK?
| --
|
Go to Step 15
|
Go to Step 14
|
14
| Repair
the open or short to ground on CKT 225 (RED).
Is the repair complete?
| --
|
Go to Step 18
| --
|
15
| Check CKT 23 (GRY) for an open or short to ground.
Is the circuit OK?
| --
|
Go to Step 17
|
Go to Step 16
|
16
| Repair
the open or short to ground on CKT 23 (GRY).
Is the repair complete?
| --
|
Go to Step 18
| --
|
17
|
- Check the powertrain control module (PCM) connectors for poor
terminal contact.
- If OK, replace the PCM. Refer to
Powertrain Control Module Replacement/Programming
in Engine Controls.
Is the repair complete?
| --
|
Go to Step 18
| --
|
18
|
- Make sure any components removed during diagnosis are installed
in place and that all connectors are connected.
- Repeat the system check. Refer to
Charging System Check
.
Is the system check complete?
| --
| System OK
| --
|
