DTC B2274: ACC Monitor Malfunction [09/2014 - ]: 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 O6 certification ECU (smart key ECU assembly) connector.
2. Disconnect the 4B 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
   O6-9 (ACCD) - 4B-19	Always	Below 1 Ω
   4B-7 - Body ground	Always	Below 1 Ω
   O6-9 (ACCD) or 4B-19 - 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 [09/2014 - ]

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
   4B-19 - 4B-7	20°C (68°F)	130.92 to 190.74 Ω
   4E-1 - 4C-20	Battery voltage not applied between terminals 4B-19 and 4B-7	10 kΩ or higher
   	Battery voltage applied between terminals 4B-19 and 4B-7	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [09/2014 - ] 

Result: 

OK 

See step  5

1. Reconnect the O6 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 [09/2014 - ]

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   O6-9 (ACCD) - Body ground	Engine switch off → Engine 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 [09/2014 - 10/2015]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - 11/2017]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2017 - 10/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - 11/2019]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2019 - 09/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2020 - 10/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

Result: 

NG 

REPLACE SMART KEY ECU ASSEMBLY. Refer to  REMOVAL [09/2014 - ]