Tire Pressure Warning Light Circuit
If the tire pressure warning ECU detects a disconnected connector or an open circuit between the tire pressure warning ECU and combination meter, the tire pressure warning light turns off 10 seconds after the ignition switch is turned to ON, blinks for 1 minute, and then remains on.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- When replacing the tire pressure warning ECU, read the transmitter IDs stored in the old ECU using the Techstream and write them down before removal.
- It is necessary to perform registration of the transmitter IDs into the tire pressure warning ECU after the ECU and/or the tire pressure warning valve and transmitter has been replaced (See page
.gif)
).
CHECK HARNESS AND CONNECTOR (COMBINATION METER - TIRE PRESSURE WARNING ECU)
(a) Disconnect the F14 meter connector.
(b) Disconnect the F7 ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
|---|---|---|
F7-5 (IND) - F14-9 (TIRE) |
Always |
Below 1 Ω |
F7-5 (IND) - Body ground |
Always |
10 kΩ or higher |
| NG | .gif) | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
.gif)
CHECK COMBINATION METER
(a) Disconnect the F7 ECU connector.
(b) Turn the ignition switch to ON and check the condition of the tire pressure warning light illumination.
ResultResult | Proceed to |
|---|---|
Turns on after blinking for 1 minute |
A |
Does not turn on after blinking for 1 minute |
B |
| A | | REPLACE TIRE PRESSURE WARNING ECU |
| B | | REPLACE COMBINATION METER ASSEMBLY |
Test yourself
A quick Toyota 4Runner quiz: every answer comes with an explanation and a link to the manual page.