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: Engine switch on (ACC) OFF: Engine switch off	-

   OK

   When the engine switch is turned on (IG), ON is displayed on the Techstream.

NG → See step   3 

OK: Go to next step 

1. Ensure the key is inside the cabin.
2. Check that the power source mode changes as shown below each time the engine switch is pushed.

   OK

   off → on (ACC) → on (IG) → off

NG → See step   4 

OK → NORMAL 

Fig 1: Checking Harness And Connector (Main Body ECU - Body Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard resistance

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

   Standard voltage

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU