| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000YZ5P |
| Model Year Start: 2017 | Model: Sienna | Prod Date Range: [08/2016 - ] |
| Title: BRAKE SYSTEM (OTHER): VACUUM WARNING SWITCH: ON-VEHICLE INSPECTION; 2017 - 2020 MY Sienna [08/2016 - ] | ||
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT BRAKE FLUID LEVEL IN RESERVOIR
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![2016 - 2020 MY Sienna [12/2015 - ]; BRAKE SYSTEM (OTHER): BRAKE FLUID: ON-VEHICLE INSPECTION+](/t3Portal/stylegraphics/info.gif)
2. INSPECT BRAKE BOOSTER ASSEMBLY
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3. REMOVE WINDSHIELD WIPER MOTOR AND LINK ASSEMBLY
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4. REMOVE FRONT OUTER COWL TOP PANEL SUB-ASSEMBLY
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5. INSPECT VACUUM WARNING SWITCH ASSEMBLY
(a) Start the engine and stop it after 1 or 2 minutes.
(b) Disconnect the connector from the vacuum warning switch assembly.
(c) Measure the resistance of the vacuum warning switch assembly.
Standard Resistance:
10 kΩ or higher
(d) With the engine stopped, depress the brake pedal several times to release vacuum from the brake booster assembly, and measure the resistance of the vacuum warning switch assembly.
Standard Resistance:
Below 1 Ω
(e) Connect the connector to the vacuum warning switch assembly.
6. INSTALL FRONT OUTER COWL TOP PANEL SUB-ASSEMBLY
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7. INSTALL WINDSHIELD WIPER MOTOR AND LINK ASSEMBLY
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