B2126-SENSOR SUPPLY VOLTAGE LOW
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
While the vehicle is in reverse for speeds less than 16km/h.
- Set Condition:
Park Assist Sensor supply voltage less than 7.2 volts.
| Possible Causes |
| (X700) PARK ASSIST SENSOR SUPPLY CIRCUIT SHORTED TO (X750) PARK ASSIST SENSOR GROUND CIRCUIT |
| (X700) PARK ASSIST SENSOR SUPPLY CIRCUIT SHORTED TO (Z171) PARK ASSIST DISPLAY GROUND CIRCUIT |
| (X700) PARK ASSIST SENSOR SUPPLY CIRCUIT SHORTED TO (Z913) PARK ASSIST MODULE GROUND CIRCUIT |
| (X700) PARK ASSIST SENSOR SUPPLY CIRCUIT SHORTED TO GROUND |
| PARK ASSIST SENSOR |
| PARK ASSIST MODULE |
Diagnostic Test
1. CHECK FOR AN ACTIVE DTC: B2126-SENSOR SUPPLY VOLTAGE LOWTurn the ignition on.
Apply the park brake.
Shift the transmission into Reverse.
With the scan tool, record and erase DTCs.
Wait 30 seconds.
With the scan tool, read DTCs.
Is the DTC B2126-SENSOR SUPPLY VOLTAGE LOW active?
Yes
- Go To 2
No
- The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
2. CHECK EACH PARK ASSIST SENSOR FOR A SHORT TO GROUND
Turn the ignition off.
Disconnect one Park Assist Sensor.
Turn the ignition on.
With the scan tool, read Park Assist Module DTCs. If DTC B2126 is still active, repeat this procedure by disconnecting another park assist sensor. However, if DTC B2126 changes from active to stored, or if all four sensors have been disconnected, proceed as follows:
Is B2126-SENSOR SUPPLY VOLTAGE LOW still active?
Yes
- Go To 3
No
- Replace the Park Assist Sensor that caused DTC B2126 to change from active to stored after disconnecting it in accordance with the service information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
3. CHECK THE (X700) PARK ASSIST SENSOR SUPPLY CIRCUIT FOR A SHORT TO (X750) PARK ASSIST SENSOR GROUND CIRCUIT
NOTE: Perform this test with all Park Assist Sensors disconnected.
Turn the ignition off.
Disconnect the Park Assist Module harness connector.
Measure the resistance between the (X700) Park Assist Sensor Supply circuit and the (X750) Park Assist Sensor Ground circuit.
Is the resistance below 10K ohms?
Yes
- Repair the (X700) Park Assist Sensor Supply circuit for a short to the (X750) Park Assist Sensor Ground circuit.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Go To 4
4. CHECK THE (X700) PARK ASSIST SENSOR SUPPLY CIRCUIT FOR A SHORT TO (Z171) PARK ASSIST DISPLAY GROUND CIRCUIT
NOTE: Perform this test with all Park Assist Sensors disconnected.
Measure the resistance between the (X700) Park Assist Sensor Supply circuit and the (Z171) Park Assist Display Ground circuit.
Is the resistance below 10K ohms?
Yes
- Repair the (X700) Park Assist Sensor Supply circuit for a short to the (Z171) Park Assist Display Ground circuit.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Go To 5
5. CHECK THE (X700) PARK ASSIST SENSOR SUPPLY CIRCUIT FOR A SHORT TO (Z913) PARK ASSIST MODULE GROUND CIRCUIT
NOTE: Perform this test with all Park Assist Sensors disconnected.
Measure the resistance between the (X700) Park Assist Sensor Supply circuit and the (Z913) Park Assist Module Ground circuit.
Is the resistance below 10K ohms?
Yes
- Repair the (X700) Park Assist Sensor Supply circuit for a short to the (Z913) Park Assist Module Ground circuit.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Go To 6
6. CHECK THE (X700) PARK ASSIST SENSOR SUPPLY CIRCUIT FOR A SHORT TO GROUND
NOTE: Perform this test with all Park Assist Sensors disconnected.
Measure the resistance between ground and the (X700) Park Assist Sensor Supply circuit.
Is the resistance below 10K ohms?
Yes
- Repair the (X700) Park Assist Sensor Supply circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Replace the Park Assist Module in accordance with the service information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)