DTC B2274: ACC Monitor Malfunction: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Read the Data List according to the displays on the Techstream.

   HINT: 

   When using the Techstream with the engine switch off, turn on and off any of the door courtesy light switches repeatedly at 1.5 second intervals or less until communication between the Techstream and vehicle starts.

   MAIN BODY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   ACC Relay Monitor	Status of ACC Relay Monitor / ON or OFF	ON: Engine switch on (ACC) OFF: Engine switch off	-

   OK

   "ON" (engine switch on (ACC)) appears on the screen.

NG → See step   3 

OK: Go to next step 

1. Clear the DTC. Refer to DTC CHECK / CLEAR .
2. Turn the engine switch on (IG).
3. After 10 seconds have elapsed, check if the trouble occurs again.

   OK

   DTC B2273 is not output.

NG → REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) 

OK → See step   6 

1. Remove the ACC relay from the relay block No. 8.
   Fig 1: Inspecting ST CUT Relay Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3 - 5	When battery voltage is not applied to terminals 1 and 2	10 kΩ or higher
   3 - 5	When battery voltage is applied to terminals 1 and 2	Below 1 Ω

NG → REPLACE ACC RELAY 

OK: Go to next step 

1. Disconnect the E50 connector.
   Fig 2: Identifying Harness E50 Connector & Starter Relay Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Relay block No. 8 ACC relay terminal 1 - E50-4 (ACCD)	Always	Below 1 Ω
   Relay block No. 8 ACC relay terminal 1 or E50-4 (ACCD) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (ACC RELAY - MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 3: Identifying ACC Relay & E50 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Relay block No. 8 ACC relay terminal 2 - Body ground	Always	Below 1 Ω

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   Relay block No. 8 ACC relay terminal 3 - Body ground	Always	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (ACC RELAY - BATTERY AND BODY GROUND) 

OK → REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)