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

Ignition switch ON, OK switch on steering pad switch not pushed

8 to 15 V

K21-5 (SI) - Body ground

W - Body ground

Input

Ignition switch ON, wheel being rotated

Pulse generation (See waveform 1)

K21-6 (+S) - Body ground

L - Body ground

Output

Ignition switch ON, wheel being rotated

Pulse generation (See waveform 1)

K21-7 (VCM) - Body ground

BE - Body ground

Input

Engine started, vacuum warning switch off (brake warning light off) → on (brake warning light on)

11 to 14 V → Below 1 V

K21-9 (S)*1 - Body ground

LA-R - Body ground

Input

Engine started → not started

11 to 14 V → Below 1 V

K21-12 (SW) - Body ground

G - Body ground

Input

Ignition switch ON, brake fluid level not low (brake warning light off) → low (brake warning light on)

11 to 14 V → Below 1 V

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

LG - SB*3
LG - BE*4

Input

Ignition switch ON, fuel level full → low (fuel level warning light on)

Pulse generation (See waveform 2)

K21-15 (FV) - Body ground

L - Body ground*3
GR - Body ground*4

Input

Ignition switch ON

Pulse generation (See waveform 3)

K21-17 (WLVL) - Body ground

LG - Body ground

Input

Ignition switch ON, washer fluid level not low → low

11 to 14 V → Below 1 V

K21-18 (RLMT) -Body ground

BE - Body ground

Output

Ignition switch ON, rear seat belt warning light LH off → on

11 to 14 V → Below 1 V

K21-19 (RCMT) -Body ground

R - Body ground

Output

Ignition switch ON, rear seat belt warning light center off → on

11 to 14 V → Below 1 V

K21-20 (RRMT) -Body ground

G - Body ground

Output

Ignition switch ON, rear seat belt warning light RH off → 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

Ignition switch ON, rear seat belt LH unfastened → fastened

Below 1 V → 11 to 14 V

K21-25 (RCSB) - Body ground

B - Body ground

Input

Ignition switch ON, rear seat belt center unfastened → fastened

Below 1 V → 11 to 14 V

K21-26 (RRSB) - Body ground

LG - Body ground

Input

Ignition switch ON, rear seat belt RH unfastened → fastened

Below 1 V → 11 to 14 V

K21-27 (OILW) - Body ground

W - Body ground

Input

Ignition switch ON, engine oil level not low → low

Below 1 V → 11 to 14 V

K21-28 (MSM+) - Body ground

GR - Body ground

Input

Ignition switch ON, up, down, right and left switches on steering pad switch not pushed

4.8 to 5.2 V

K21-29 (MSTI) - Body ground

R - Body ground

Input

Ignition switch ON, OK and back switches on steering pad switch not pushed

4.8 to 5.2 V

K21-31 (CANL)

Input/Output

K21-32 (CANH)

Input/Output

K21-33 (FE) - Body ground

SB - Body ground*3
BE - Body ground*4

Always

Below 1 Ω

K21-35 (FR2) - K21-33 (FE)*3

V - SB

Input

Ignition switch ON, fuel level full → low (fuel level warning light on)

Pulse generation (See waveform 2)

K21-36 (TX+)*2

Input/Output

K21-37 (TX-)*2

Input/Output

K21-39 (IG+) - Body ground

LA-GR - Body ground

Input

Ignition switch off → Ignition switch ON

Below 1 V → 11 to 14 V

K21-40 (B) - Body ground

LA-B - Body ground

Input

Always

11 to 14 V

K20-1 (ODO) - Body ground

LA-L - Body ground

Input

Ignition switch ON, ODO/TRIP switch not pushed

4.8 to 5.2 V

K20-2 (TR) - Body ground

L - Body ground

Input

Ignition switch ON, light control rheostat up switch and light control rheostat down switch not pushed

4.8 to 5.2 V

K20-3 (HAZ) - Body ground

LA-R - Body ground

Input

Hazard warning signal switch off → 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

LA-G - Body ground

Output

Ignition switch ON, RH turn indicator light off → blinking

Below 1 V → 11 to 14 V ←→ Below 1 V

K20-8 (B) - Body ground

LA-B - Body ground

Input

Always

11 to 14 V

K20-10 (TRNL) - Body ground

BE - Body ground

Output

Ignition switch ON, LH turn indicator light off → blinking

Below 1 V → 11 to 14 V ←→ Below 1 V

K20-11 (LL) - Body ground

LA-LG - Body ground

Output

Ignition switch ON, LH turn indicator light off → blinking

Below 1 V → 11 to 14 V ←→ Below 1 V

K20-13 (TRNR) - Body ground

BE - Body ground

Output

Ignition switch ON, RH turn indicator light off → blinking

Below 1 V → 11 to 14 V ←→ Below 1 V

*1: for 2GR-FKS
*2: for 9 Inch Display Type Radio and Display Receiver Assembly
*3: for AWD
*4: for 2WD

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	Ignition switch ON, 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
*: for AWD
Tester connection	K21-14 (FR) - K21-33 (FE) K21-35 (FR2) - K21-33 (FE)*
Tool setting	2.5 V/DIV., 20 ms./DIV.
Condition	Ignition switch ON, fuel level full → low (fuel level warning light on)

HINT:

The magnitude of the voltage (A) changes as shown in the following tables.

for 2WD:

Condition	Voltage
Ignition switch ON, fuel level full	4.0 to 4.6 V
Ignition switch ON, fuel level low (fuel level warning light on)	0.3 to 1.5 V

for AWD:

Condition	Voltage
Condition	K21-14 (FR) - K21-33 (FE)	K21-35 (FR2) - K21-33 (FE)
Ignition switch ON, fuel level full	4.2 to 4.6 V	4.0 to 4.6 V
Ignition switch ON, fuel level 1/2	4.2 to 4.6 V	0.3 to 0.7 V
Ignition switch ON, fuel level low (fuel level warning light on)	0.3 to 1.5 V	0.3 to 0.7 V

Waveform 3:

Item	Condition
Tester connection	K21-15 (FV) - Body ground
Tool setting	2.5 V/DIV., 20 ms./DIV.
Condition	Ignition switch ON
Standard voltage	4.5 to 5.5 V