DTC B2274: ACC Monitor Malfunction [10/2014 - ]: 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 I53 certification ECU (smart key ECU assembly) connector.
2. Disconnect the 4C and 4D instrument panel junction block assembly connectors.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I53-9 (ACCD) - 4C-28	Always	Below 1 Ω
   4D-9 - Body ground	Always	Below 1 Ω
   I53-9 (ACCD) or 4C-28 - 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 [10/2014 - 05/2019] , or refer to REMOVAL [05/2019 - ]

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
   4C-28 - 4D-9	20°C (68°F)	130.92 to 190.74 Ω
   4F-1 - 4D-51	Auxiliary battery voltage not applied to terminals 4C-28 and 4D-9	10 kΩ or higher
   	Auxiliary battery voltage applied to terminals 4C-28 and 4D-9	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [10/2014 - 05/2019]  , or refer to  REMOVAL [05/2019 - ] 

Result: 

OK 

See step  5

1. Reconnect the I53 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 [10/2014 - 05/2019] , or refer to INSTALLATION [05/2019 - ]

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   I53-9 (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 [10/2014 - 09/2017]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2017 - 05/2019]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [05/2019 - 10/2019]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2019 - 07/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [07/2020 - ] 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [10/2014 - ]