Engine Hood Courtesy Switch Circuit
- The security courtesy switch is built into the hood lock. This switch turns on when the engine hood is opened and turns off when the engine hood is closed.
PROCEDURE
READ VALUE USING TECHSTREAM (SECURITY COURTESY SWITCH)
(a) Using the Techstream, read the Data List (See page .gif)
).
Main Body
Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
|---|---|---|---|
Hood Courtesy SW |
Security courtesy switch / ON or OFF |
ON: Engine hood open OFF: Engine hood closed |
- |
OK:
ON (engine hood open) and OFF (engine hood closed) appear on screen according to condition of engine hood.
| OK | .gif) | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
.gif)
INSPECT SECURITY COURTESY SWITCH
(a) Disconnect the A19 switch connector. |
 |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
|---|---|---|
1 (GRD) - 2 (CTYH) |
Unlock position |
Below 1 Ω |
1 (GRD) - 2 (CTYH) |
Lock position |
10 kΩ or higher |
| NG | | REPLACE SECURITY COURTESY SWITCH |
|
CHECK HARNESS AND CONNECTOR (SECURITY COURTESY SWITCH - MAIN BODY ECU AND BODY GROUND)
(a) Disconnect the A19 switch connector.
(b) Remove the main body ECU (See page ).
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
|---|---|---|
A19-2 (CTYH) - A-20 (HCTY) |
Always |
Below 1 Ω |
A19-1 (GRD) - Body ground |
Always |
Below 1 Ω |
A19-2 (CTYH) or A-20 (HCTY) - Body ground |
Always |
10 kΩ or higher |
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
Test yourself
A quick Toyota 4Runner quiz: every answer comes with an explanation and a link to the manual page.