Last Modified: 11-29-2007 1.6 U
Service Category: Vehicle Interior Section: Meter/Gauge/Display
Model Year: 2008 Model: Sequoia Doc ID: RM000002Z4N006X
Title: METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: TERMINALS OF ECU (2008 Sequoia)

TERMINALS OF ECU

1. CHECK COMBINATION METER



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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

H37-1 (RHIG) - Body ground

W - Body ground

Power source for light control rheostat

Ignition switch ON

4.6 to 5.4 V

H37-2 (TR) - Body ground

LG - Body ground

Light control rheostat knob input

Light control rheostat knob fully turned downward

Below 1 Ω

Light control rheostat knob fully turned upward

10 kΩ or higher

H37-3 (E2) - Body ground

G - Body ground

Light control rheostat switch ground

Always

Below 1 Ω

H37-5 (CHK) - Body ground

R - Body ground

MIL input signal

Ignition switch ON, MIL ON

Below 3 V

Ignition switch off, MIL OFF

11 to 14 V

H37-6 (SW) - Body ground

Y - Body ground

RSCA OFF indicator light input signal

Ignition switch ON, RSCA OFF indicator light ON

Below 1 V

Ignition switch ON, RSCA OFF indicator light OFF

8 to 14 V

H37-7 (TIRE) - Body ground

LG - Body ground

Tire pressure warning light input signal

Ignition switch ON, tire pressure warning light ON

Below 1.5 V

Ignition switch ON, tire pressure warning light OFF

8 V or higher

H37-8- (CHG-) - Body ground

B - Body ground

CHARGE warning light

Ignition switch ON, CHARGE warning light ON

Below 1 V

Ignition switch ON, CHARGE warning light OFF

11 to 14 V

H37-10 (WLVL) - Body ground

P - Body ground

Washer level warning light

Ignition switch ON, washer level warning light ON

Below 1 V

Ignition switch ON, washer level warning light OFF

11 to 14 V

H37-11 (S) - Body ground

BR - Body ground

Oil pressure warning light

Ignition switch ON, oil pressure warning light ON

Below 1 V

Ignition switch ON, oil pressure warning light OFF

11 to 14 V

H37-12 (L) - H37-39 (E3)

V - Y

Fuel sender gauge

Ignition switch ON, fuel sender gauge ON

Below 1 V

Ignition switch ON, fuel sender gauge OFF

11 to 14 V

H37-14 (SW) - Body ground

Y - Body ground

Brake fluid level warning light signal

Ignition switch ON, BRAKE warning light ON

Below 1 V

Ignition switch ON, BRAKE warning light OFF

11 to 14 V

H37-16 (B) - Body ground

B - Body ground

Turn signal L

Ignition switch ON, turn signal switch neutral position

Below 1 V

Ignition switch ON, turn signal switch turned to left

Alternating between below 1 and 11 to 14 V

H37-17 (B) - Body ground

G - Body ground

Turn signal R

Ignition switch ON, turn signal switch neutral position

Below 1

Ignition switch ON, turn signal switch turned to right

Alternating between below 1 and 11 to 14 V

H37-18 (B) - Body ground

LG - Body ground

Power source

Always

11 to 14 V

H37-20 (IG+) - Body ground

P - Body ground

Ignition switch signal

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

H37-23 (P) - Body ground

O - Body ground

A/T shift position signal P

Ignition switch ON, shift lever not in P

Below 1 V

Ignition switch ON, shift lever in P

11 to 14 V

H37-24 (R) - Body ground

V - Body ground

A/T shift position signal R

Ignition switch ON, shift lever not in R

Below 1 V

Ignition switch ON, shift lever in R

11 to 14 V

H37-25 (N) - Body ground

L - Body ground

A/T shift position signal N

Ignition switch ON, shift lever not in N

Below 1 V

Ignition switch ON, shift lever in N

11 to 14 V

H37-26 (D) - Body ground

G - Body ground

A/T shift position signal D

Ignition switch ON, shift lever not in D

Below 1 V

Ignition switch ON, shift lever in D

11 to 14 V

H37-27 (4) - Body ground

P - Body ground

A/T shift position signal S

Ignition switch ON, shift lever not in S

Below 1 V

Ignition switch ON, shift lever in S

11 to 14 V

H37-28 (A/B) - Body ground

R - Body ground

Drive monitor switch (INFO) signal

Ignition switch ON, drive monitor switch (INFO) OFF

10 kΩ or higher

Ignition switch ON, drive monitor switch (INFO) ON

Below 1 Ω

H37-29 (E) - Body ground

O - Body ground

Drive monitor switch (SETUP US/M) signal

Ignition switch ON, drive monitor switch (SETUP US/M) OFF

10 kΩ or higher

Ignition switch ON, drive monitor switch (SETUP US/M) OFF

Below 1 Ω

H37-30 (RSET) - Body ground

L - Body ground

Drive monitor switch (SELECT RESET) signal

Ignition switch ON, drive monitor switch (SELECT RESET) OFF

10 kΩ or higher

Ignition switch ON, drive monitor switch (SELECT RESET) ON

Below 1 Ω

H37-31 (TX+) - Body ground

Y - Body ground

Accessory meter input signal

Ignition switch ON

10 kΩ or higher

H37-35 (+S) - Body ground

V - Body ground

Speed signal (output)

Ignition switch ON, wheel turned slowly

Pulse generation

H37-36 (SI) - Body ground

GR - Body ground

Speed signal (input)

Ignition switch ON, wheel turned slowly

Pulse generation

H37-37 (ILL-) - Body ground

R - Body ground

Illumination ground

Always

Below 1 Ω

H37-38 (TC)*1 - Body ground

SB - Body ground

TAIL cancel switch signal

TAIL cancel switch OFF

10 kΩ or higher

TAIL cancel switch ON

Below 1 Ω

H37-39 (E3) - Body ground

Y - Body ground

Fuel sender gauge ground

Always

Below 1 Ω

H37-40 (E1) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

*1: w/ TAIL cancel switch

2. CHECK ACCESSORY METER



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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

I22-3 (RR)*1 - Body ground

W - Body ground

Ultrasonic sensor (for rear corner RH)

Clearance warning indicator LED for rear corner RH illuminates

Below 3 V

I22-4 (FR)*1 - Body ground

Y - Body ground

Ultrasonic sensor (for front corner RH)

Clearance warning indicator LED for front corner RH illuminates

Below 3 V

I22-5 (BK)*1 - Body ground

O - Body ground

Ultrasonic sensor (for rear corner LH and RH)

Clearance warning indicator LED for back right and left sensor illuminates

Below 3 V

I22-6 (OP)*1 - Body ground

P - Body ground

Clearance warning ECU signal

Clearance warning indicator's operation indicator illuminates

Below 3 V

I22-7 (RL)*1 - Body ground

GR - Body ground

Ultrasonic sensor (for rear corner LH)

Clearance warning indicator LED for rear corner LH illuminates

Below 3 V

I22-8 (FL)*1 - Body ground

LG - Body ground

Ultrasonic sensor (for front corner LH)

Clearance warning indicator LED for front corner LH illuminates

Below 3 V

I22-10 (TX-) - Body ground

V - Body ground

Cruise information signal

Cruise information displays

Communication signal

I22-11 (BZ)*1 - Body ground

L - Body ground

Clearance warning buzzer

Clearance warning buzzer sounding (when the back sonar or clearance sonar senses something)

Pulse generation

I22-12 (E) - Body ground

W-B - Body ground

ECU ground

Always

Below 1 Ω

I22-16 (MHTR) - Body ground

BR - Body ground

Security indicator signal

Security indicator illuminates (illuminates only for 60 sec. in alarm sounding states (blinks when system is in armed state))

3 to 5 V

I22-17 (LP) - Body ground

V - Body ground

Security indicator light signal

Immobiliser set status (SET)

Alternating between 11 to 14 V and below 1 V

Immobiliser set status (UNSET)

Below 1 V

I22-20 (ILL-) - Body ground

B - Body ground

Illumination signal

Ignition switch ON

11 to 14 V

I22-21 (ILL+) - Body ground

O - Body ground

Illumination signal

Headlight dimmer switch ON

11 to 14 V

I22-22 (ACC) - Body ground

GR - Body ground

ACC power source

Ignition switch ACC

11 to 14 V

I22-23 (IG) - Body ground

G - Body ground

IG power source

Ignition switch ON

11 to 14 V

I22-24 (B) - Body ground

R - Body ground

+B power source

Always

11 to 14 V

*1: w/ Intuitive Parking Assist System

3. CHECK COMBINATION METER INNER CIRCUIT