Side Auto Step Switch Circuit
The side auto step controller ECU assembly receives the door open/closed signal from each door courtesy light switch via the side auto step switch assembly.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
HINT:
Inspection should be performed on the door courtesy switch circuit on the side where the automatic running board is malfunctioning.
PROCEDURECHECK HARNESS AND CONNECTOR (SIDE AUTO STEP SWITCH - SIDE AUTO STEP CONTROLLER ECU)
(a) Disconnect the F90 side auto step switch assembly connector.
(b) Disconnect the A42 side auto step controller ECU assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
for LHTester Connection | Condition | Specified Condition |
|---|---|---|
F90-4 (ECU1) - A42-14 (CTY1) |
Always |
Below 1 Ω |
Tester Connection | Condition | Specified Condition |
|---|---|---|
F90-6 (ECU2) - A42-13 (CTY2) |
Always |
Below 1 Ω |
Standard Resistance (Check for Short):
for LHTester Connection | Condition | Specified Condition |
|---|---|---|
A42-14 (CTY1) - Body ground |
Always |
10 kΩ or higher |
Tester Connection | Condition | Specified Condition |
|---|---|---|
A42-13 (CTY2) - Body ground |
Always |
10 kΩ or higher |
| OK | .gif) | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| 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.