DTC B2274: ACC Monitor Malfunction: Procedure

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE 

OK: Go to next step 

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the D41 certification ECU (smart key ECU assembly) connector.
2. Disconnect the 3A instrument panel junction block assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D41-4 (ACCD) - 3A-20	Always	Below 1 Ω
   3A-12 - Body ground	Always	Below 1 Ω
   D41-4 (ACCD) or 3A-20 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the instrument panel junction block assembly. Refer to REMOVAL [03/2012 - ] .
2. Remove the main body ECU (network gateway ECU) from the instrument panel junction block assembly.
3. Measure the resistance according to the value(s) in the table below.
   Fig 1: Inspecting Instrument Panel Junction Block Assembly (ACC1, ACC2 Relay)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *a

   Component without harness connected (Instrument Panel Junction Block Assembly)

   -

   -

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3E-1 - 3B-28	When battery voltage absent	10 kΩ or higher
   	When battery voltage is applied to terminals 3A-20 and 3A-12	Below 1 Ω
   3E-1 - 3A-10	When battery voltage absent	10 kΩ or higher
   	When battery voltage is applied to terminals 3A-20 and 3A-12	Below 1 Ω

NG → See step   8 

OK: Go to next step 

1. Install the main body ECU (network gateway ECU) to the instrument panel junction block assembly. Refer to REMOVAL [03/2012 - ] .
2. Install the instrument panel junction block assembly.
3. Reconnect the D41 certification ECU (smart key ECU assembly) connector.
   Fig 2: Identifying D41 Certification ECU (Smart Key ECU Assembly) Connector

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   D41-4 (ACCD) - Body ground	Engine switch off → Engine switch on (ACC)	Below 1 V → 8.5 V or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Certification ECU (Smart Key ECU Assembly))

NG → See step   6 

OK → See step   7