| Last Modified: 11-29-2007 | 1.6 J | |
| Service Category: Vehicle Exterior | Section: Window/Glass | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000002ZCE004X |
| Title: WINDOW / GLASS: WINDSHIELD DEICER SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
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
INSPECTION PROCEDURE
PROCEDURE
|
1. |
PERFORM ACTIVE TEST USING TECHSTREAM (DEICER RELAY) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test / Deicer Relay (Front)
(e) Check that the deicer operation.
Air Conditioner
|
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Deicer Relay (Front) |
Deicer relay operation |
OFF or ON |
- |
OK:
Deicer operates on and off.
|
|
2. |
CHECK AIR CONDITIONING SYSTEM (LIN COMMUNICATION) |
(a) Operate the integration control and panel to change the set temperature and check that the temperature at the outlets changes.
OK:
The outlet temperature changes in accordance with the operation of the control panel
|
|
3. |
REPLACE INTEGRATION CONTROL AND PANEL |
(a) Temporarily replace the integration control and panel with a new or normally functioning one
.
|
|
4. |
CHECK INTEGRATION CONTROL AND PANEL (OPERATION) |
(a) Check that the malfunction disappears.
OK:
Malfunction disappears.
|
|
5. |
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 Connection |
Condition |
Specified Condition |
|---|---|---|
|
DEICER fuse |
Always |
Below 1 Ω |
(c) Reinstall the DEICER fuse.
|
|
6. |
INSPECT DEICER RELAY |
(a) Remove the DEICER relay from the engine room relay block.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
3 - 5 |
When battery voltage is not applied between terminals 1 and 2 |
10 kΩ or higher |
|
When battery voltage is applied to terminals 1 and 2 |
Below 1 Ω |
(c) Reinstall the DEICER relay.
|
|
7. |
CHECK HARNESS AND CONNECTOR (DEICER RELAY - AIR CONDITIONING AMPLIFIER AND BATTERY) |
(a) Remove the deicer relay from the engine room relay block.
(b) Disconnect the H24 air conditioning amplifier connector.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
Deicer relay terminal 1 - Body ground |
Ignition switch ON |
11 to 14 V |
|
Deicer relay terminal 5 - Body ground |
Always |
11 to 14 V |
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Deicer relay terminal 2 - H24-40 (D) |
Always |
Below 1 Ω |
|
Deicer relay terminal 2 - Body ground |
Always |
10 kΩ or higher |
(e) Reconnect the air conditioning amplifier connector.
(f) Reinstall the deicer relay.
|
|
8. |
CHECK HARNESS AND CONNECTOR (DEICER RELAY - WINDSHIELD DEICER WIRE) |
(a) Remove the deicer relay from the engine room relay block.
(b) Disconnect the A23 windshield deicer wire connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A25-1 (B) - Deicer relay terminal 3 |
Always |
Below 1 Ω |
|
Deicer relay terminal 3 - Body ground |
Always |
10 kΩ or higher |
(d) Reconnect the A25 windshield deicer wire connector.
(e) Reinstall the deicer relay.
|
|
9. |
CHECK HARNESS AND CONNECTOR (WINDSHIELD DEICER WIRE - BODY GROUND) |
(a) Disconnect the A25 windshield deicer wire connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A25-2 (E) - Body ground |
Always |
Below 1 Ω |
(c) Reconnect the windshield deicer wire connector.
|
|
10. |
CHECK WINDSHIELD DEICER WIRE (SYSTEM VOLTAGE) |
(a) Disconnect the A25 windshield deicer wire connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
A25-1 (B) - A25-2 (E) |
Ignition switch ON Windshield deicer switch ON |
11 to 14 V |
(c) Reconnect the windshield deicer wire connector.
|
|
|