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

1.CHECK FOR AN ACTIVE DTC: B2126-SENSOR SUPPLY VOLTAGE LOW

Is the DTC B2126-SENSOR SUPPLY VOLTAGE LOW active?

Yes

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

Is B2126-SENSOR SUPPLY VOLTAGE LOW still active?

Yes

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.

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)

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.

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)

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.

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)

6.CHECK THE (X700) PARK ASSIST SENSOR SUPPLY CIRCUIT FOR A SHORT TO GROUND

NOTE: Perform this test with all Park Assist Sensors disconnected.

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)

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)