DTC B279A: Theft Deterrent System Communication Line High Fixation [08/2013 - ]: Procedure

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

CLEAR DTC
1. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2013 - ] .
NEXT: Go to next step

CHECK FOR DTC

Turn the power switch on (IG) and wait 10 seconds.

Check for DTCs. Refer to DTC CHECK / CLEAR [08/2013 - ] .

Result

Result	Proceed to
DTC B279A is output	A
DTC B279A and other DTCs are output	B

HINT:

If DTCs other than DTC B279A are output, troubleshoot those DTCs first.

B → See step 10

A: Go to next step

CHECK CONNECTION OF CONNECTOR
1. Turn the power switch off.
2. Check that the connectors are properly connected to the power management control ECU and ID code box (immobiliser code ECU).
  OK
  
  Connectors are properly connected.
NG → CONNECT CONNECTORS PROPERLY

OK: Go to next step

CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILISER CODE ECU) - POWER MANAGEMENT CONTROL ECU)

Disconnect the H15 ID code box (immobiliser code ECU) connector.
Disconnect the H2 power management control ECU connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
H15-4 (EFIO) - H2-21 (IMI)	Always	Below 1 Ω
H2-21 (IMI) - Body ground	Always	10 kΩ or higher

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Condition	Specified Condition
H2-21 (IMI) - Body ground	Always	Below 1 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)
1. Replace the ID code box (immobiliser code ECU) with a new one. Refer to REMOVAL [08/2013 - ] .
NEXT: Go to next step
REGISTER RECOGNITION CODES
1. Register the recognition codes in the ECUs. Refer to REGISTRATION [08/2013 - ] .
NEXT: Go to next step
REGISTER ECU COMMUNICATION ID
1. Register the ECU communication ID. Refer to REGISTRATION [08/2013 - ] .
NEXT: Go to next step
CLEAR DTC
1. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2013 - ] .
NEXT: Go to next step
CHECK FOR DTC
1. Check for DTCs. Refer to DTC CHECK / CLEAR [08/2013 - ] .
  HINT:
  
  Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.
  
  OK
  
  DTC B279A is not output.
NG → See step 11

OK → END (ID CODE BOX (IMMOBILISER CODE ECU) WAS DEFECTIVE)
GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2013 - ]
REPLACE POWER MANAGEMENT CONTROL ECU. Refer to REMOVAL [08/2013 - ]