DTC B126A: Remote Engine Starter ECU Communication Stop; DTC B1269: Theft Deterrent ECU Communication Stop [08/2014 - ]: Procedure

1. Check if the accessory ECU (theft deterrent ECU or remote engine start ECU) is installed.

   Result

   Result	Proceed to
   Installed	A
   Not installed	B

B → See step   3 

A: Go to next step 

1. Disconnect the L7 main body ECU (multiplex network body ECU) connector.
2. Disconnect the L79 option connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L7-4 (BTX) - L79-1 (BTX)	Always	Below 1 Ω
   L7-16 (BRX) - L79-2 (BRX)	Always	Below 1 Ω
   L7-4 (BTX) - Body ground	Always	10 kΩ or higher
   L7-16 (BRX) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE OPTION CONNECTOR 

HINT: 

After removing the accessory ECU (theft deterrent ECU or remote engine start ECU) connected to the main body ECU (multiplex network body ECU), initialize the main body ECU (multiplex network body ECU).

1. Initialize the ECU connection information.
   1. Connect the Techstream to the DLC3.
   2. Turn the power switch on (IG)
   3. Turn the Techstream on.
   4. Enter the following menus: Body Electrical / Main Body / Utility.
   5. Select Initialization from Utility to initialize the ECU

NEXT: Go to next step 

1. Clear the DTC. Refer to DTC CHECK / CLEAR [08/2014 - ] .
2. Recheck for DTCs.

   OK

   DTC B126A and B1269 are not output.

NG → See step   5 

OK → END