DTC B2274: ACC Monitor Malfunction [10/2015 - ]: Procedure

See step  1

Result

Result: 

NG 

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

Result: 

OK 

See step  2

See step  2

Result

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Disconnect the 2A and 2B instrument panel junction block assembly connectors.
2. Measure the resistance according to the value (s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J41-16 (ACCD) - 2A-30	Always	Below 1 Ω
   2B-3 - Body ground	Always	Below 1 Ω
   J41-16 (ACCD) or 2A-30 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Remove the instrument panel junction block assembly.

   Refer to REMOVAL [10/2015 - 08/2016] , or refer to REMOVAL [08/2016 - 03/2018] , or refer to REMOVAL [03/2018 - 08/2019] , or refer to REMOVAL [08/2019 - ]

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component without harness connected (Instrument Panel Junction Block Assembly)

   -

   -

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2A-30 - 2B-3	20°C (68°F)	285.71 to 428.57 Ω
   2E-1 - 2A-40	Auxiliary battery voltage not applied between terminals 2A-30 and 2B-3	10 kΩ or higher
   	Auxiliary battery voltage not applied between terminals 2A-30 and 2B-3	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [10/2015 - 08/2016]  , or refer to  REMOVAL [08/2016 - 03/2018]  , or refer to  REMOVAL [03/2018 - 08/2019]  , or refer to  REMOVAL [08/2019 - ] 

Result: 

OK 

See step  5

1. Reconnect the J41 certification ECU (smart key ECU assembly) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

2. Install the instrument panel junction block assembly.

   Refer to INSTALLATION [10/2015 - 03/2018] , or refer to INSTALLATION [03/2018 - ]

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   J41-16 (ACCD) - Body ground	Power switch off → Power switch on (ACC)	1 V or less → 8.5 V or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (TEMPORARY CONNECTION FAILURE IS SUSPECTED). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - 08/2016]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2016 - 12/2017]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2017 - 03/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2018 - 08/2019]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2019 - 07/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [07/2020 - ] 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [10/2015 - 08/2016]  , or refer to  REMOVAL [08/2016 - 03/2018]  , or refer to  REMOVAL [03/2018 - 08/2019]  , or refer to  REMOVAL [08/2019 - ]