C211E-BATTERY SUPPLY VOLTAGE LOW
For a complete wiring diagram Refer to Section 8W
- When Monitored:
Continuously.
- Set Condition:
The All Wheel Drive (AWD) Control Module detects that the Fused Battery (+) circuit voltage is below 2.0 volts for more than 1 second.
| Possible Causes |
| CHARGING SYSTEM DTCS PRESENT |
| (A923) FUSED B+ CIRCUIT OPEN OR HIGH RESISTANCE |
| (Z967) GROUND CIRCUIT OPEN OR HIGH RESISTANCE |
| ALL WHEEL DRIVE (AWD) CONTROL MODULE |
| TOTALLY INTEGRATED POWER MODULE (TIPM) |
Diagnostic Test
1. CHARGING SYSTEM DTCS PRESENTIgnition on, engine not running.
With the scan tool, select View DTCs in the Powertrain Control Module.
Are there any Charging System or related voltage DTCs present?
Yes
- Refer to the symptom list and perform any Charging System DTC diagnostic procedures before continuing with this test.
No
- Go to 2
2. CHECK FOR ACTIVE DTC
NOTE: Leave the ignition on for 2 seconds.
With the scan tool, read DTCs.
Is the DTC active at this time?
Yes
- Go to 3
No
- Go to 8
3. CHECK THE TIPM FUSED B+ VOLTAGE
While back probing, measure the voltage of the (A923) Fused B+ circuit in the TIPM C7 harness connector.
Is the voltage below 2 volts?
Yes
- Go to 7
No
- Go to 4
4. (A923) FUSED B+ CIRCUIT OPEN OR HIGH RESISTANCE
Turn the ignition off.
Disconnect the AWD module harness connector.
Ignition on, engine not running.
With a 12-volt test light connected to ground, check the (A923) Fused B(+) circuit in the AWD Control Module harness connector.
NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
Does the test light illuminate brightly?
Yes
- Go to 5
No
- Repair the (A923) Fused B+ circuit for an open circuit or high resistance.
- Perform AWD Control Module VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE/ELECTRONICALLY CONTROLLED CLUTCH - STANDARD PROCEDURE).
5. (Z967) GROUND CIRCUIT OPEN OR HIGH RESISTANCE
Using a 12-volt test light connected to B(+), check the (Z967) Ground circuit in the AWD Control Module harness connector.
NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
Does the test light illuminate brightly?
Yes
- Go to 6
No
- Repair the (Z967) Ground circuit for an open circuit or high resistance.
- Perform AWD Control Module VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE/ELECTRONICALLY CONTROLLED CLUTCH - STANDARD PROCEDURE).
6. AWD CONTROL MODULE
NOTE: Before continuing, check the AWD Module harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors.
Pay particular attention to all Power and Ground circuits.
View repair.
Repair
- Replace the AWD Control Module in accordance with the Service information.
- Perform AWD Control Module VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE/ELECTRONICALLY CONTROLLED CLUTCH - STANDARD PROCEDURE).
7. TOTALLY INTEGRATED POWER MODULE
NOTE: Before continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors.
Pay particular attention to all Power and Ground circuits.
View repair.
Repair
- Replace the Totally Integrated Power Module in accordance with the Service Information.
- Perform AWD Control Module VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE/ELECTRONICALLY CONTROLLED CLUTCH - STANDARD PROCEDURE).
8. INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
Wiggle test the wiring harness and connectors while checking for shorted and open circuits.
Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to change or for the DTC to reset.
Were there any problems found?
Yes
- Repair as necessary.
- Perform AWD Control Module VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE/ELECTRONICALLY CONTROLLED CLUTCH - STANDARD PROCEDURE)
No
- Test Complete.