DTC B2274: ACC Monitor Malfunction: Procedure

1. Use the Data List to check if the ACC relay is functioning properly.
   MAIN BODY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   ACC Relay Monitor	D-ACC relay monitor/ON or OFF	ON: Power switch ON (ACC) OFF: Power switch OFF	-

   OK

   When the power switch is turned ON (ACC), ON is displayed on the Techstream screen.

NG → See step   3 

OK: Go to next step 

1. Ensure the key is inside the cabin.
2. With the brake pedal released, check that the power source mode changes as shown below each time the power switch is pushed.

   OK

   OFF → ON (ACC) → ON (IG) → OFF

NG → See step   4 

OK → See step   5 

Fig 1: Identifying Main Body ECU Connector Terminal Identification

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the L13, DF and DA main body ECU connectors.
2. Measure the voltage and resistance according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Condition	Specified Condition
   DF-1 - Body ground	Always	11 to 14 V

   Standard resistance

   Tester Connection	Condition	Specified Condition
   L13-22 (ACCD) - DA-19	Always	Below 1 Ω
   DA-40 (GND1) - Body ground	Always	Below 1 Ω
   L13-22 (ACCD) or DA-19 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU