Inspection of Combination Meter and Its Circuit

Precautions: Precautions for Body, Cab and Accessories · General safety (00)

Voltage and Signal Check

1)Remove combination meter (with connectors connected).

2)Check voltage and/or pulse signal using voltmeter and oscilloscope.

NOTE:

•Check that battery voltage is 12 V or more.
•Outputs from terminals marked with asterisk (*) cannot be measured with voltmeter because they are pulse signals. Use oscilloscope for measuring these outputs.

[A]:	Combination meter connector (View: [a])

“G240” connector

Terminal No.	Wire color	Circuit	Normal voltage	Condition
G240-1	PNK	Passenger air bag indicator dimmer control (if equipped)	Approx. 12.0 V	Ignition: “ON” Lighting switch: Other than OFF position
G240-1	PNK	Passenger air bag indicator dimmer control (if equipped)	0 V	Ignition: “ON” Lighting switch: OFF position
G240-2	WHT	Backup power supply (Non ENG A-STOP model)	Approx. 12.0 V	Ignition: “OFF”, “ACC” or “ON”
G240-2	BLU	Backup power supply (ENG A-STOP model)	Approx. 12.0 V	Ignition: “OFF”, “ACC”, “ON” or during engine auto start control
G240-3	RED	Power supply	Approx. 12.0 V	Ignition: “ON”
G240-5	GRY	GND	0 V	Ignition: Any position
G240-6*	LT BLU	LIN communication signal (Parking sensor system control module)	Refer to reference waveform. LIN communication signal (Parking sensor system control module)
G240-7	RED	Dimmer switch signal (high beam)	Approx. 12.0 V	Dimmer switch: Other than high beam position
G240-7	RED	Dimmer switch signal (high beam)	0 V	Dimmer switch: High beam position
G240-9*	WHT	CAN communication signal (low)	Refer to reference waveform. CAN communication signal
G240-10*	WHT	CAN communication signal (low)
G240-12*	WHT	CAN communication signal (low)
G240-14*	YEL	Fuel level sensor signal (power supply)	Refer to reference waveform. Fuel level sensor signal
G240-15	GRY	Ground for fuel level sensor signal (GND)	0 V	Ignition: Any position
G240-17*	PPL	LED illumination signal	Refer to reference waveform. Illumination control signal
G240-18	BLK	GND	0 V	Ignition: Any position
G240-19*	LT GRN	Bulb illumination signal	Refer to reference waveform. Illumination control signal
G240-21*	RED	CAN communication signal (high)	Refer to reference waveform. CAN communication signal
G240-22*	RED	CAN communication signal (high)
G240-24*	RED	CAN communication signal (high)

Reference Waveform

Oscilloscope display

Shown below is typical waveform display provided by oscilloscope.

NOTE:

•Display includes the following types of data:

[a]:	Waveform of channel 1	[c]:	VOLT/DIV of each channel
[b]:	Ground level of each channel	[d]:	TIME/DIV

•Waveform varies depending on measurement condition and vehicle spec.

LIN communication signal (Parking sensor system control module)

Channel	Probe	Terminal No.
1	+	G240-6
1	–	G240-5

Measurement condition

•Ignition: “ON”
•Parking sensor system: operating

1.	LIN communication signal

CAN communication signal

CAN communication signal (High)

Channel	Probe	Terminal No.
1	+	G240-21 G240-22 G240-24
1	–	G240-5

CAN communication signal (Low)

Channel	Probe	Terminal No.
2	+	G240-9 G240-10 G240-12
2	–	G240-5

Measurement condition

•Ignition: “ON”

1.	CAN communication signal (high)
2.	CAN communication signal (low)

Fuel level sensor signal

Channel	Probe	Terminal No.
1	+	G240-14
1	–	G240-15

Measurement condition

•Ignition: “ON”
•Fuel: full

1.	Fuel level sensor signal

•Ignition: “ON”
•Fuel: empty

1.	Fuel level sensor signal

Illumination control signal

Channel	Probe	Terminal No.
1	+	G240-17 G240-19
1	–	G240-5

Measurement condition

•Ignition: “ON”
•Lighting switch: Other than OFF position
•Illumination control: 7th position (Brightest)

1.	Illumination control signal

•Ignition: “ON”
•Lighting switch: Other than OFF position
•Illumination control: 4th position

1.	Illumination control signal

•Ignition: “ON”
•Lighting switch: Other than OFF position
•Illumination control: 1st position (Dimmest)

1.	Illumination control signal