DTC B2274: ACC Relay Control Circuit [11/2021 - ]: Procedure

1. Inspect CAN communication system.

   Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - ]

   Is the check result OK?

   Result	Proceed to
   Yes	A
   No (Perform the inspection according to the diagnosis for CAN communication system.)	B

Result: 

B 

PERFORM THE INSPECTION ACCORDING TO THE DIAGNOSIS FOR CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - ] 

Result: 

A 

See step  2

1. Turn the ignition switch to OFF.
2. Check the fuse.

   Is the check result OK?

   Result	Proceed to
   Yes	A
   No (Replace the fuse. When the replaced fuse is blown immediately, check the power supply circuit for short circuited.)	B

Result: 

B 

REPLACE FUSE 

1. Replace the fuse.
2. When the replaced fuse is blown immediately, check the power supply circuit for short circuited.

Result: 

A 

See step  3

1. Disconnect the connector from the smart key ECU assembly.
2. Turn the ignition switch to ON.
3. Using a tester, measure the voltage between the smart key ECU assembly connector and chassis ground.

   Connector & terminal

   F8-1 (+B2) (+) - Chassis ground (-)

   F8-4 (+B1) (+) - Chassis ground (-)

   Is the voltage 9.5 - 16 V?

   Result	Proceed to
   Yes	A
   No (Check the power supply circuit.)	B

Result: 

B 

CHECK THE POWER SUPPLY CIRCUIT 

Result: 

A 

See step  4

1. Turn the ignition switch to OFF.
2. Using a tester, measure the resistance between the smart key ECU assembly connector and chassis ground.

   Connector & terminal

   F9-17 (GND2) - Chassis ground

   F8-20 (GND1) - Chassis ground

   Is the resistance less than 1 Ω?

   Result	Proceed to
   Yes	A
   No (Repair or replace the open circuit of harness.)	B

Result: 

B 

REPAIR OR REPLACE THE OPEN CIRCUIT OF HARNESS 

Result: 

A 

See step  5

1. Using a tester, measure the resistance between the smart key ECU assembly connector and chassis ground.

   Connector & terminal

   F8-16 (ACCD) - Chassis ground

   Is the resistance 152.61 - 216.5 Ω? (At 20°C)

   Result	Proceed to
   Yes	A
   No	B

Result: 

A 

See step  7

Result: 

B 

See step  6

1. Perform inspection of ACC relay unit.

   Refer to ON-VEHICLE INSPECTION [11/2021 - ]

   Is the relay OK?

   Result	Proceed to
   Yes	A
   No (Replace the relay.)	B

Result: 

B 

REPLACE RELAY 

Result: 

A 

See step  7

1. Using a tester, measure the resistance between the smart key ECU assembly connector and the ACC1 relay and ACC2 relay, and between the ACC1 relay and ACC2 relay and chassis ground.

   Connector & terminal

   F8-16 (ACCD) - 2A-20

   2A-12 - Chassis ground

   2A-13 - Chassis ground

   Is the resistance less than 1 Ω?

   Result	Proceed to
   Yes	A
   No (Repair or replace the open circuit of harness.)	B

Result: 

B 

REPAIR OR REPLACE THE OPEN CIRCUIT OF HARNESS 

Result: 

A 

See step  8

1. Connect the disconnected connectors.
2. Using a tester, measure the voltage between smart key ECU assembly connectors.

   Connector & terminal

   F8-16 (ACCD) (+) - Chassis ground (-)

   Does the voltage change as 1 V or less → 9.5 - 16 V according to the operation of OFF → ACC ON?

   Result	Proceed to
   Yes (Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.) HINT:  In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.	A
   No (Replace the smart key ECU assembly.)	B

Result: 

A 

END 

1. Even if DTC is displayed, the circuit has returned to a normal condition at this time.
2. Reproduce the failure, and then perform the diagnosis again.

   HINT: 

   In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

Result: 

B 

REPLACE SMART KEY ECU ASSEMBLY. Refer to  REMOVAL [11/2021 - ]