DTC B126A: Remote Engine Starter ECU Communication Stop [08/2015 - ]: Procedure

1. Disconnect the I141 remote engine starter ECU connector.
2. Measure the voltage and resistance according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   I141-10 (R+B) - Body ground	Always	11 to 14 V
   I141-1 (RSIG) - Body ground	Engine switch on (IG)	11 to 14 V
   I141-1 (RSIG) - Body ground	Engine switch off	Below 1 V

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I141-19 (RGN1) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the I13 main body ECU (multiplex network body ECU) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I13-25 (BTX) - I141-4 (BTX)	Always	Below 1 Ω
   I13-26 (BRX) - I141-3 (BRX)	Always	Below 1 Ω
   I13-25 (BTX) - Body ground	Always	10 kΩ or higher
   I13-26 (BRX) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Temporarily replace the remote engine starter ECU with a new one. Refer to REMOVAL [08/2015 - ] .

NEXT: Go to next step 

1. Register the remote engine starter ID. Refer to REGISTRATION [08/2015 - ] .

NEXT: Go to next step 

1. Clear the DTC. Refer to DTC CHECK / CLEAR [08/2015 - ] .
2. Perform the remote engine start operation.
3. Check for DTCs.

   OK

   DTC B126A is not output.

NG → See step   6 

OK → END (REMOTE ENGINE STARTER ECU WAS DEFECTIVE)