METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: TERMINALS OF ECU; 2021 - 2024 MY Camry HV [10/2020

TERMINALS OF ECU

COMBINATION METER ASSEMBLY

(a) Measure the voltage and resistance and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Signal Input/Output

Condition

Specified Condition

K21-1 (ILL-) - Body ground

LA-L - Body ground

Output

Taillights off → Taillights on

Below 1 V → Pulse generation

K21-2 (EP) - Body ground

W-B - Body ground

Always

Below 1 Ω

K21-4 (INT) - Body ground

L - Body ground

Output

Power switch on (IG)
Steering pad switch assembly operated, "TPWS" selected on the multi-information display and "OK" switch (steering pad switch assembly) pressed and held → "OK" switch (steering pad switch assembly) off

Below 1.5 V → 8 to 15 V

K21-5 (SI) - Body ground

W - Body ground

Input

Power switch on (IG), wheel being rotated

Pulse generation (See waveform 1)

K21-6 (+S) - Body ground

L - Body ground

Output

Power switch on (IG), wheel being rotated

Pulse generation (See waveform 1)

K21-14 (FR) - K21-33 (FE)

LG - BE

Input

Power switch on (IG), fuel level full → Fuel level low (fuel level warning light on)

Pulse generation (See waveform 4)

K21-15 (FV) - Body ground

GR - Body ground

Input

Power switch on (IG)

Pulse generation (See waveform 5)

K21-17 (WLVL) - Body ground

LG - Body ground

Input

Power switch on (IG), washer fluid level not low → Washer fluid level low

11 to 14 V → Below 1 V

K21-18 (RLMT) -Body ground

BE - Body ground

Output

Rear seat belt warning light LH off → Rear seat belt warning light LH on

11 to 14 V → Below 1 V

K21-19 (RCMT) -Body ground

R - Body ground

Output

Rear seat belt warning light center off → Rear seat belt warning light center on

11 to 14 V → Below 1 V

K21-20 (RRMT) -Body ground

G - Body ground

Output

Rear seat belt warning light RH off → Rear seat belt warning light RH on

11 to 14 V → Below 1 V

K21-21 (ES) - Body ground

W-B - Body ground

Always

Below 1 Ω

K21-24 (RLSB) - Body ground

SB - Body ground

Input

Power switch on (IG), rear seat belt LH unfastened → Fastened

Below 1 V → 11 to 14 V

K21-25 (RCSB) - Body ground

B - Body ground

Input

Power switch on (IG), rear seat belt center unfastened → Fastened

Below 1 V → 11 to 14 V

K21-26 (RRSB) - Body ground

LG - Body ground

Input

Power switch on (IG), rear seat belt RH unfastened → Fastened

Below 1 V → 11 to 14 V

K21-27 (OILW) - Body ground

W - Body ground

Input

Power switch on (IG), engine oil level not low → Engine oil level low

Below 1 V → 11 to 14 V

K21-28 (MSM+) - Body ground

GR - Body ground

Input

Power switch on (IG), up, down, right and left switches on steering pad switch assembly not pushed

4.8 to 5.2 V

K21-29 (MSTI) - Body ground

R - Body ground

Input

Power switch on (IG), OK and back switches on steering pad switch assembly not pushed

4.8 to 5.2 V

K21-31 (CANL) - Body ground

W - Body ground

Input/Output

K21-32 (CANH) - Body ground

B - Body ground

Input/Output

K21-34 (LST1) - Body ground

L - Body ground

Input

"Ready to Refuel" displayed on multi-information display

Pulse generation (See waveform 2)

"Close Fuel Lid" displayed on multi-information display

Pulse generation (See waveform 3)

Power switch on (IG)

11 to 14 V

K21-36 (TX+)* - Body ground

G - Body ground

Input/Output

K21-37 (TX-)* - Body ground

W - Body ground

Input/Output

K21-39 (IG+) - Body ground

LA-GR - Body ground

Input

Power switch off → Power switch on (IG)

Below 1 V → 11 to 14 V

K21-40 (B) - Body ground

LA-B - Body ground

Input

Power switch off

11 to 14 V

K20-1 (ODO) - Body ground

LA-L - Body ground

Input

Power switch on (IG), ODO/TRIP switch (trip switch) not pushed

4.8 to 5.2 V

K20-2 (TR) - Body ground

L - Body ground

Input

Power switch on (IG), light control rheostat up switch (trip switch) and light control rheostat down switch (trip switch) not pushed

4.8 to 5.2 V

K20-3 (HAZ) - Body ground

LA-R - Body ground

Input

Hazard warning signal switch off → Hazard warning signal switch pushed

11 to 14 V → Below 1 V

K20-5 (SW3) - Body ground

LA-B - Body ground

Always

Below 1 Ω

K20-7 (LR) - Body ground

G - Body ground

Output

RH turn indicator light off → RH turn indicator light blinking

Below 1 V → 11 to 14 V ←→ Below 1 V

K20-8 (B) - Body ground

B - Body ground

Input

Power switch off

11 to 14 V

K20-10 (TRNL) - Body ground

BE - Body ground

Output

LH turn indicator light off → LH turn indicator light blinking

Below 1 V → 11 to 14 V ←→ Below 1 V

K20-11 (LL) - Body ground

LG - Body ground

Output

LH turn indicator light off → LH turn indicator light blinking

Below 1 V → 11 to 14 V ←→ Below 1 V

K20-13 (TRNR) - Body ground

BE - Body ground

Output

RH turn indicator light off → RH turn indicator light blinking

Below 1 V → 11 to 14 V ←→ Below 1 V

*: for 9 Inch Display Type Radio and Display Receiver Assembly

Waveform 1:

Item	Condition
Tester connection	K21-5 (SI) - Body ground K21-6 (+S) - Body ground
Tool setting	5 V/DIV., 20 ms./DIV.
Condition	Power switch on (IG), wheel being rotated

HINT:

When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

Waveform 2:

Item	Condition
Tester Connection	K21-34 (LST1) - Body ground
Tool setting	5 V/DIV., 20 ms./DIV.
Condition	"Ready to Refuel" displayed on multi-information display

Waveform 3:

Item	Condition
Tester Connection	K21-34 (LST1) - Body ground
Tool setting	5 V/DIV., 20 ms./DIV.
Condition	"Close Fuel Lid" displayed on multi-information display

HINT:

This waveform is output when the fuel lid opener switch is operated if the fuel lid is open and any of the following conditions are met:

The vehicle has been driven for 1 km (0.6 mile) or more at a speed of 50 km/h (31 mph) or more.
30 minutes or more have elapsed since the fuel lid opener switch was operated.

Waveform 4:

Item	Condition
Tester Connection	K21-14 (FR) - K21-33 (FE)
Tool setting	2.5 V/DIV., 20 ms./DIV.
Condition	Power switch on (IG), fuel level full → Fuel level low (fuel level warning light on)

HINT:

(A) varies depending on the fuel level.
Power switch on (IG), fuel level full → Fuel level low (fuel level warning light on) (4.1 to 4.6 V → 0.3 to 1.2 V)

Waveform 5:

Item	Condition
Tester Connection	K21-15 (FV) - Body ground
Tool setting	2.5 V/DIV., 20 ms./DIV.
Condition	Power switch on (IG)

HINT:

Power switch on (IG) (4.5 to 5.5 V)