Toyota Tundra. Manual — part 758

TERMINALS OF ECU

1. CHECK AIR CONDITIONING AMPLIFIER

Fig. 182: Identifying J19 And z1 Air Conditioning Amplifier Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

a. Disconnect the J19 air conditioning amplifier connector.

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

AIR CONDITIONING AMPLIFIER RESISTANCE AND VOLTAGE

If the result is not as specified, there may be a malfunction on the wire harness side.

c. Reconnect the J19 air conditioning amplifier connector.

d. Measure the voltage according to the value(s) in the table below.

AIR CONDITIONING AMPLIFIER VOLTAGE

Wire harness

-

Terminal No.

(Symbols)

Wiring Color Terminal Description

Condition

Specified

Condition

J19-1 (IG+) - J19-14

(GND)

P-W-B

Ignition power supply

Ignition switch
ON

11 to 14 V

Ignition switch

OFF

Below 1 V

J19-21 (B) - J19-14

(GND)

R-W-B

Battery power source Always

11 to 14 V

J19-37 (LIN1) - J19-14

(GND)

SB - W-B

LIN communication
signal

Ignition switch
ON

Pulse generation

J19-14 (GND) - Body

ground

W-B - Body

ground

Ground

Always

Below 1 ohms

Terminal No.

(Symbols)

Wiring Color

Terminal

Description

Condition

Specified

Condition

J19-40 (D) - J19-

Ignition switch ON
Defogger switch
OFF

11 to 14 V

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Windshield/WindowGlass - Tundra

If the result is not as specified, the air conditioning amplifier or fuse may have a malfunction.

2. CHECK INTEGRATION CONTROL AND PANEL

Fig. 183: Identifying J37 Integration Control And Panel Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

a. Disconnect the J37 integration control and panel connector.

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

INTEGRATION CONTROL AND PANEL RESISTANCE AND VOLTAGE

If the result is not as specified, there may be a malfunction on the wire harness side.

DATA LIST / ACTIVE TEST

1. ACTIVE TEST

HINT:

Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be
operated without removing any parts. This non-intrusive functional inspection can be very useful because
intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests

14 (GND)

GR-W-B

Defogger relay

Ignition switch ON
Defogger switch
ON

Below 1 V

Terminal No.

(Symbols)

Wiring Color Terminal Description

Condition

Specified

Condition

J37-16 (IG+) - J37-1

(GND)

P-W-B

Ignition power supply

Ignition switch
OFF

Below 1 V

Ignition switch

ON

11 to 14 V

J37-3 (STX) - J37-1

(GND)

SB - W-B

LIN communication
circuit

Ignition switch
ON

Pulse generation

J37-1 (GND) - Body

ground

W-B - Body

ground

Ground

Always

Below 1 ohms

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Windshield/WindowGlass - Tundra

early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while
performing Active Tests.

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch ON.

c. Turn the Techstream on.

d. Enter the following menus: Body / Air Conditioner / Active Test.

e. According to the display on the Techstream, perform the "Active Test".

Air Conditioner

AIR CONDITIONER - TECHSTREAM TESTER DISPLAY REFERENCE CHART

WINDSHIELD DEICER DOES NOT OPERATE

DESCRIPTION

When the windshield deicer switch turns is turned ON, a windshield deicer activation request signal is sent via
the LIN communication line to the air conditioning amplifier. Then the air conditioning amplifier operates the
windshield deicer.

WIRING DIAGRAM

Tester Display

Test Part

Control Range Diagnostic Note

Deicer Relay (Front) Deicer relay operation

OFF or ON

-

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Windshield/WindowGlass - Tundra

Fig. 184: Windshield Deicer Does Not Operate Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

HINT:

This circuit uses the LIN communication line. Before performing the inspection, check that the LIN
communication system is functioning normally (see HOW TO PROCEED WITH TROUBLESHOOTING ).

1. PERFORM ACTIVE TEST BY TECHSTREAM (DEICER RELAY)

a. Select the Active Test using the Techstream to generate a control command, and then check that the

windshield deicer operates.

Air Conditioner

AIR CONDITIONER - TECHSTREAM TESTER DISPLAY REFERENCE CHART

OK: Deicer relay turns ON and OFF.

NG: Go to step 3

OK: Go to Next Step

2. CHECK INTEGRATION CONTROL AND PANEL (OPERATION)

a. Temporarily replace the integration control and panel with a new or normally functioning one.

1. For Column Shift Type, refer to the following procedures (see INTEGRATION

CONTROL AND PANEL (FOR COLUMN SHIFT TYPE) ).

2. For Floor Shift Type, refer to the following procedures (see INTEGRATION CONTROL

AND PANEL (FOR FLOOR SHIFT TYPE) ).

b. Check that the malfunction disappears.

OK: Malfunction disappears.

NG: REPLACE AIR CONDITIONING AMPLIFIER (See AIR CONDITIONING AMPLIFIER )

OK: END (INTEGRATION CONTROL AND PANEL IS DEFECTIVE)

3. INSPECT FUSE (DEICER)

a. Remove the DEICER fuse from the engine room relay block.

b. Measure the resistance according to the value(s) in the table below.

Standard resistance

Tester Display

Test Part

Control Range Diagnostic Note

Deicer Relay (Front) Deicer relay operation

OFF or ON

-

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Windshield/WindowGlass - Tundra