| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000ZY83 |
| Model Year Start: 2017 | Model: Sienna | Prod Date Range: [08/2016 - ] |
| Title: LIGHTING (EXT): LIGHTING SYSTEM: Headlight Relay Circuit; 2017 - 2020 MY Sienna [08/2016 - ] | ||
|
Headlight Relay Circuit |
DESCRIPTION
The main body ECU controls the headlight relay.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
|
1. |
PERFORM ACTIVE TEST USING TECHSTREAM (HEADLIGHT 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 / Main Body / Active Test.
(e) Check that the relays operate.
Main Body
|
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Headlight Relay |
Low beam headlight relay |
ON/OFF |
- |
OK:
Relays operates. (Low beam headlights illuminate.)
| OK |
|
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (See page
|
|
|
2. |
INSPECT HEADLIGHT RELAY (H-LP RELAY) |
(a) Remove the headlight relay.
(b) Inspect the headlight relay (See page
![2017 - 2020 MY Sienna [08/2016 - ]; LIGHTING (EXT): RELAY: ON-VEHICLE INSPECTION](/t3Portal/stylegraphics/info.gif)
).
| NG |
|
REPLACE HEADLIGHT RELAY |
|
|
3. |
CHECK HARNESS AND CONNECTOR (BATTERY - HEADLIGHT RELAY) |
(a) Remove the headlight relay.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
1 - Body ground |
Always |
11 to 14 V |
|
3 - Body ground |
Always |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) |
(a) Disconnect the 2F instrument panel junction block assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
2 - 2F-25 |
Always |
Below 1 Ω |
|
2 or 2F-25 - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
5. |
INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
|
(a) Remove the instrument panel junction block assembly. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
2F-25 - 2I-15 (HRLY) |
Always |
Below 1 Ω |
|
2F-25 or 2I-15 (HRLY) - Body ground |
Always |
10 kΩ or higher |
| OK |
|
| NG |
|
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
|
|