METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: TERMINALS OF ECU; 2018 MY Camry [03/2017

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

Headlight dimmer switch off → Dimmer switch in tail or head position

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
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

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) → Vacuum warning switch on (brake warning light on)

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) → Brake fluid level low (brake warning light on)

11 to 14 V → Below 1 V

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

LG - BE

Input

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

Pulse generation (See waveform 2)

K21-15 (FV) - Body ground

GR - Body ground

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 → Washer fluid level 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 → Rear seat belt warning light LH 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 → Rear seat belt warning light center 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 → 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

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 → Engine oil level 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 assembly 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 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

K21-36 (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

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 (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 (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

LA-G - Body ground

Output

Ignition switch ON, 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

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 → LH turn indicator light 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 → LH turn indicator light 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 → RH turn indicator light blinking

Below 1 V → 11 to 14 V ←→ Below 1 V

*: for 8 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	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
Tester connection	K21-14 (FR) - K21-33 (FE)
Tool setting	2.5 V/DIV., 20 ms./DIV.
Condition	Ignition switch ON, fuel level full → fuel level low (fuel level warning light on)

HINT:

(A) varies depending on the fuel level.
Ignition switch ON, fuel level full (4.1 to 4.6 V) → Fuel level low (fuel level warning light on) (0.3 to 1.7 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

HINT:

Ignition switch ON (4.5 to 5.5 V)