DTC B1207:86 [ELECTRICAL SUPPLY UNIT (ESU)]

id0902ff061100

Description

Error signal received from SAS control module

Detection condition

•  The electrical supply unit (ESU) detected the following conditions for 2 s or more with the ignition switched ON (engine off or on).

―  Error signal is received from SAS control module even though the collision detection unlock function presence signal received from the BCM determines that the function is present.

Fail-safe

Not applicable

Possible cause

•  BCM connector or terminal malfunction

•  Electrical supply unit (ESU) connector or terminal malfunction

•  Short to ground in wiring harness between SAS control module terminal 2AE and electrical supply unit (ESU) terminal 2H

•  Short to power supply in wiring harness between SAS control module terminal 2AE and electrical supply unit (ESU) terminal 2H

•  Open circuit in wiring harness between SAS control module terminal 2AE and electrical supply unit (ESU) terminal 2H

•  SAS control module malfunction

•  Electrical supply unit (ESU) malfunction

Description	Error signal received from SAS control module
Detection condition	• The electrical supply unit (ESU) detected the following conditions for 2 s or more with the ignition switched ON (engine off or on). ― Error signal is received from SAS control module even though the collision detection unlock function presence signal received from the BCM determines that the function is present.
Fail-safe	Not applicable
Possible cause	• BCM connector or terminal malfunction • Electrical supply unit (ESU) connector or terminal malfunction • Short to ground in wiring harness between SAS control module terminal 2AE and electrical supply unit (ESU) terminal 2H • Short to power supply in wiring harness between SAS control module terminal 2AE and electrical supply unit (ESU) terminal 2H • Open circuit in wiring harness between SAS control module terminal 2AE and electrical supply unit (ESU) terminal 2H • SAS control module malfunction • Electrical supply unit (ESU) malfunction

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT SAS CONTROL MODULE CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Disconnect the SAS control module connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
1		No	Repair or replace the connector, then go to Step 7.
2	INSPECT ELECTRICAL SUPPLY UNIT (ESU) CONNECTOR CONDITION • Disconnect the electrical supply unit (ESU) connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
2		No	Repair or replace the connector, then go to Step 7.
3	INSPECT WIRING HARNESS BETWEEN SAS CONTROL MODULE AND ELECTRICAL SUPPLY UNIT (ESU) FOR SHORT TO GROUND • Verify that the SAS control module and electrical supply unit (ESU) connectors are disconnected. • Inspect for continuity between SAS control module terminal 2AE (wiring harness-side) and body ground. • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between SAS control module terminal 2AE and electrical supply unit (ESU) terminal 2H. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. Go to Step 7.
3		No	Go to the next step.
4	INSPECT WIRING HARNESS BETWEEN SAS CONTROL MODULE AND ELECTRICAL SUPPLY UNIT (ESU) FOR SHORT TO POWER SUPPLY • Verify that the SAS control module and electrical supply unit (ESU) connectors are disconnected. • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Switch the ignition ON (engine off or on). • Measure the voltage at the SAS control module terminal 2AE (wiring harness-side). • Is the voltage 0 V?	Yes	Go to the next step.
4		No	Refer to the wiring diagram and verify whether or not there is a common connector between SAS control module terminal 2AE and electrical supply unit (ESU) terminal 2H. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to power supply. Go to Step 7.
5	INSPECT WIRING HARNESS BETWEEN SAS CONTROL MODULE AND ELECTRICAL SUPPLY UNIT (ESU) FOR OPEN CIRCUIT • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Verify that the SAS control module and electrical supply unit (ESU) connectors are disconnected. • Inspect the wiring harness for continuity between SAS control module terminal 2AE (wiring harness-side) and electrical supply unit (ESU) terminal 2H (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
5		No	Refer to the wiring diagram and verify whether or not there is a common connector between SAS control module terminal 2AE and electrical supply unit (ESU) terminal 2H. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 7.
6	VERIFY IF MALFUNCTIONING LOCATION IS SAS CONTROL MODULE DEPENDING ON REPEATABILITY • Always reconnect all disconnected connectors. • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Clear the DTC for the electrical supply unit (ESU) using the M-MDS. (See CLEARING DTC [ELECTRICAL SUPPLY UNIT (ESU)].) • Switch the ignition ON (engine off or on) and wait for 2 s or more. • Retrieve the electrical supply unit (ESU) DTCs using the M-MDS. (See DTC INSPECTION [ELECTRICAL SUPPLY UNIT (ESU)].) • Is the same DTC displayed?	Yes	Replace the SAS control module, then go to the next step. (See SAS CONTROL MODULE REMOVAL/INSTALLATION [STANDARD DEPLOYMENT CONTROL SYSTEM].) (See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)
6		No	Go to Step 8.
7	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Always reconnect all disconnected connectors. • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Clear the DTC for the electrical supply unit (ESU) using the M-MDS. (See CLEARING DTC [ELECTRICAL SUPPLY UNIT (ESU)].) • Switch the ignition ON (engine off or on) and wait for 2 s or more. • Retrieve the electrical supply unit (ESU) DTCs using the M-MDS. (See DTC INSPECTION [ELECTRICAL SUPPLY UNIT (ESU)].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the electrical supply unit (ESU). (See ELECTRICAL SUPPLY UNIT (ESU) REMOVAL/INSTALLATION.) Go to the next step.
7		No	Go to the next step.
8	VERIFY IF OTHER DTCs DISPLAYED • Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [ELECTRICAL SUPPLY UNIT (ESU)].)
8		No	DTC troubleshooting completed.