Inspection of Keyless Entry Control Module and Its Circuits

Precautions: Precautions for Diagnosing Trouble · Precautions for Replacing Ignition Key (Ignition Switch Model) · Precautions for Transmitter Disposal (Ignition Switch Model) · Precautions for Replacing Keyless Entry Control Module (Ignition Switch Model) · Precautions for Body, Cab and Accessories · General safety (00)

Voltage and Signal Check

Check voltage and/or pulse signal of keyless entry control module (3) using voltmeter (1) and oscilloscope (2).

NOTE:

•Check that battery voltage is 12 V or more.
•Voltage of terminal with asterisk (*) cannot be measured by voltmeter because it is pulse signal. Check it with oscilloscope if necessary.

[A]:	Keyless entry control module connector (View: [a])

“E484” connector

Terminal No.	Wire color	Circuit	Normal voltage	Condition
E484-1	BRN	Backup power supply	10 – 14 V	—
E484-2*	BLU	Hood latch switch signal (if equipped)	Refer to Hood latch switch signal, door key cylinder switch signal, rear end door switch signal, door switch signal and rear end door opener switch signal.
E484-2*	BLU	Hood latch switch signal (if equipped)	Approx. 0 V	Hood latch: Latch released
E484-3	RED	Horn relay	Approx. 0 V	Horn: Sounding
E484-3	RED	Horn relay	10 – 14 V	Other than above condition
E484-8	PNK	Power supply for starting motor control relay (if equipped)	10 – 14 V	Engine: Cranking
E484-8	PNK	Power supply for starting motor control relay (if equipped)	Approx. 0 V	Other than above condition

“G16” connector

Terminal No.	Wire color	Circuit	Normal voltage	Condition
G16-6	YEL	Immobilizer control module	—	—
G16-7	GRN	Immobilizer control module	—	—
G16-9*	RED	CAN communication line (high)	Refer to CAN communication signal.
G16-13	BLK	Immobilizer control module	—	—
G16-14	GRY	Ground for keyless entry control module	Approx. 0 V	—
G16-16	LT GRN	Theft deterrent light signal	0 ← → 14 V	Theft deterrent light: Blinking
G16-16	LT GRN	Theft deterrent light signal	10 – 14 V	Other than above condition
G16-17	GRY	Immobilizer control module	—	—
G16-18	BLU	Ignition switch illumination signal	Approx. 0 V	Ignition switch illumination: Lit
G16-18	BLU	Ignition switch illumination signal	10 – 14 V	Ignition switch illumination: Not lit
G16-19*	WHT	CAN communication line (low)	Refer to CAN communication signal.

“L21” connector

Terminal No.	Wire color	Circuit	Normal voltage	Condition
L21-13*	BRN	Door key cylinder switch signal (Unlock)	Refer to Hood latch switch signal, door key cylinder switch signal, rear end door switch signal, door switch signal and rear end door opener switch signal.
L21-13*	BRN	Door key cylinder switch signal (Unlock)	Approx. 0 V	Door key cylinder switch: Unlocked
L21-14*	GRN	Rear end door switch signal	Refer to Hood latch switch signal, door key cylinder switch signal, rear end door switch signal, door switch signal and rear end door opener switch signal.
L21-14*	GRN	Rear end door switch signal	Approx. 0 V	Rear end door: Opened
L21-15*	BLU	Rear door switch signal (R)	Refer to Hood latch switch signal, door key cylinder switch signal, rear end door switch signal, door switch signal and rear end door opener switch signal.
L21-15*	BLU	Rear door switch signal (R)	Approx. 0 V	Rear door (R): Opened
L21-16*	PNK	Driver door switch signal	Refer to Hood latch switch signal, door key cylinder switch signal, rear end door switch signal, door switch signal and rear end door opener switch signal.
L21-16*	PNK	Driver door switch signal	Approx. 0 V	Driver door: Opened
L21-18*	BLU	Door key cylinder switch signal (Lock)	Refer to Hood latch switch signal, door key cylinder switch signal, rear end door switch signal, door switch signal and rear end door opener switch signal.
L21-18*	BLU	Door key cylinder switch signal (Lock)	Approx. 0 V	Door key cylinder switch: Locked
L21-19	LT BLU	Power source (ACC)	10 – 14 V	Ignition: “ACC” or “ON”
L21-19	LT BLU	Power source (ACC)	Approx. 0 V	Other than above condition
L21-20	RED	Backup power supply	10 – 14 V	—
L21-34*	WHT	Rear door switch signal (L)	Refer to Hood latch switch signal, door key cylinder switch signal, rear end door switch signal, door switch signal and rear end door opener switch signal.
L21-34*	WHT	Rear door switch signal (L)	Approx. 0 V	Rear door (L): Opened
L21-35*	RED	Passenger door switch signal	Refer to Hood latch switch signal, door key cylinder switch signal, rear end door switch signal, door switch signal and rear end door opener switch signal.
L21-35*	RED	Passenger door switch signal	Approx. 0 V	Passenger door: Opened
L21-36	BLK	Ground for keyless entry control module	Approx. 0 V	—
L21-37*	LT GRN	Rear end door opener switch	Refer to Hood latch switch signal, door key cylinder switch signal, rear end door switch signal, door switch signal and rear end door opener switch signal.
L21-37*	LT GRN	Rear end door opener switch	Approx. 0 V	Rear end opener switch: Pushed
L21-38	PNK	Ignition “ST” signal (if equipped)	10 – 14 V	Ignition: “ST”
L21-38	PNK	Ignition “ST” signal (if equipped)	Approx. 0 V	Other than above condition
L21-39	GRN	Power source (IG)	10 – 14 V	Ignition: “ON”
L21-39	GRN	Power source (IG)	Approx. 0 V	Other than above condition
L21-40	BLU	Key reminder switch signal	10 – 14 V	Ignition key: Inserted to ignition key cylinder
L21-40	BLU	Key reminder switch signal	Approx. 0 V	Ignition key: Pulled out from ignition key cylinder

Reference Waveform

Oscilloscope display

Shown below is typical waveform display provided by oscilloscope.

NOTE:

•How to read waveforms is shown below.

[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.

Hood latch switch signal, door key cylinder switch signal, rear end door switch signal, door switch signal and rear end door opener switch signal

Hood latch switch signal

Channel	Probe	Terminal No.
1	+	E484-2
1	–	G16-14

Measurement condition

•Hood latch: Fully latched

Door key cylinder switch (Unlock) signal

Channel	Probe	Terminal No.
1	+	L21-13
1	–	G16-14

Measurement condition

•Door key cylinder switch (Unlock): OFF

Rear end door switch signal

Channel	Probe	Terminal No.
1	+	L21-14
1	–	G16-14

Measurement condition

•Rear end door: Closed

Rear door switch signal (R)

Channel	Probe	Terminal No.
1	+	L21-15
1	–	G16-14

Measurement condition

•Rear door (R): Closed

Driver door switch signal

Channel	Probe	Terminal No.
1	+	L21-16
1	–	G16-14

Measurement condition

•Driver door: Closed

Door key cylinder switch (Lock) signal

Channel	Probe	Terminal No.
1	+	L21-18
1	–	G16-14

Measurement condition

•Door key cylinder switch (Lock): OFF

Rear door switch signal (L)

Channel	Probe	Terminal No.
1	+	L21-34
1	–	G16-14

Measurement condition

•Rear door (L): Closed

Passenger door switch signal

Channel	Probe	Terminal No.
1	+	L21-35
1	–	G16-14

Measurement condition

•Passenger door: Closed

Rear end door opener switch signal

Channel	Probe	Terminal No.
1	+	L21-37
1	–	G16-14

Measurement condition

•Rear end door opener switch: Released

CAN communication signal

CAN communication signal (High) (1)

Channel	Probe	Terminal No.
1	+	G16-9
1	–	G16-14

CAN communication signal (Low) (2)

Channel	Probe	Terminal No.
2	+	G16-19
2	–	G16-14

Measurement condition

•Ignition: “ON”