Toyota CH-R Service Manual: System Voltage or GND Energization Malfunction (B228B)

Toyota CH-R Service Manual / Theft Deterrent / Keyless Entry / Smart Key System(for Start Function) / System Voltage or GND Energization Malfunction (B228B)

DESCRIPTION

This DTC is stored when there is a malfunction in the certification ECU (smart key ECU assembly) battery power supply circuit or ground circuit.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
B228B	System Voltage or GND Energization Malfunction	Either of the following malfunctions is detected (a vehicle speed sensor malfunction is detected) (1-trip detection logic*): A malfunction is detected in the certification ECU (smart key ECU assembly) battery power supply circuit. A malfunction is detected in the certification ECU (smart key ECU assembly) ground circuit.	AM2 fuse Wire harness or connector	Drive the vehicle.

*: Only detected while a malfunction is present and the engine switch is on (IG).

DTC Detection Conditions

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	Drive the vehicle.	○	○
Malfunction Status	A malfunction is detected in the certification ECU (smart key ECU assembly) battery power supply circuit.	○	-
Malfunction Status	A malfunction is detected in the certification ECU (smart key ECU assembly) ground circuit.	-	○
Detection Time		-	-
Number of Trips		1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

Vehicle Condition and Fail-safe Function when Malfunction Detected

Vehicle Condition when Malfunction Detected	Fail-safe Function when Malfunction Detected
The engine stopped while driving.	-

Related Data List and Active Test Items

DTC No.	Data List and Active Test
B228B	-

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
The smart key system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Start Function) after confirming that the communication systems are functioning properly.
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Inspect the fuses of circuits related to this system before performing the following procedure.
After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

HINT:

When the cable is disconnected and reconnected to the negative (-) battery terminal, the power source mode returns to the state it was in before the cable was disconnected.

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (POWER SOURCE)

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

2.	CHECK HARNESS AND CONNECTOR (GROUND)

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END (TEMPORARY CONNECTION FAILURE IS SUSPECTED)

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

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