B2274

THEFT DETERRENT / KEYLESS ENTRY: SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function): B2274: ACC Monitor Malfunction
B2274 - ACC Monitor Malfunction

DESCRIPTION

This DTC is stored when there is a problem in the ACC output circuit. The ACC circuit is the circuit that goes from inside the power management control ECU to the ACC relay.

HINT
* When the power management control ECU is replaced with a new one and the cable is connected to the negative (-) auxiliary battery terminal, the power source mode changes to on (IG).
* When the auxiliary battery cable is disconnected and reconnected, the power source returns to the mode it was in before the auxiliary battery cable was disconnected.

This DTC is stored when a malfunction in the ACC output circuit between the ACC output terminal of the power management control ECU and the ACC relay is detected.





* *: Only output while a malfunction is present and the power switch is on (IG)

Vehicle Condition and Fail-safe Function when Malfunction Detected





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* When using the Techstream with the power switch off, perform either of the following: 1) Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and vehicle begins, or 2) connect the Techstream to the vehicle, select the vehicle type under manual mode, and then enter the following menus:
for Power Source Control: Body Electrical / Power Source Control / Trouble Codes.
for Smart Access: Body Electrical / Smart Access / Trouble Codes.
* The smart access system with push-button start uses multiplex communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting How to Proceed With Troubleshooting.
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.
* When the power source mode cannot change to on (ACC), the audio and navigation systems do not operate.
* After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

HINT

Related Data List and Active Test Items








PROCEDURE

1. CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - POWER MANAGEMENT CONTROL ECU) B2271

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND) B2271

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly Removal.





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

Standard Resistance:





Text in Illustration





NG -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Removal
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INSTRUMENT PANEL J/B)

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BODY GROUND)

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

6. INSPECT POWER MANAGEMENT CONTROL ECU

(a) Reinstall the instrument panel junction block assembly.





(b) Reconnect the H3 and H4 connectors.

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

Standard Voltage:





Text in Illustration





NG -- REPLACE POWER MANAGEMENT CONTROL ECU Removal

OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting