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Toyota Sequoia (2005). Manual - part 891
I24379
Wire Harness Side:
I18635
1
2
3
4
5
I18635
1
2
3
4
5
–
BODY ELECTRICAL
TRAILER TOWING
BE–149
3553
2.
Trailer Socket 7 Pin Type:
INSPECT BRAKE CONTROLLER CIRCUIT
Remove the brake controller with the connector still connected
and inspect the wire harness side connector from the back side,
as shown in the table below.
Tester connection
Condition
Specified condition
1 – 3
Stop light switch ON (Brake pedal depressed)
10 – 14
V
1 – 3
Stop light switch OFF (Brake pedal released)
0 V
2 – 3
Always
10 – 14 V
3 – 4
Stop light switch ON (Brake pedal depressed)
10 – 14 V
3 – 4
Stop light switch OFF (Brake pedal released)
0 V
3 – 5
Light control switch TAIL or HEAD
10 – 14
V
3 – 5
Light control switch OFF
0 V
If the circuit is not as specified, inspect the circuit connected to
other parts.
3.
INSPECT TOWING TAIL RELAY CONTINUITY
Condition
Tester connection
Specified condition
Always
1 – 2
Continuity
Always
3 – 5
No continuity
Apply B+ between
terminals 1 and 2.
3 – 5
Continuity
If continuity is not as specified, replace the relay.
4.
INSPECT BATT CHARGE RELAY CIRCUIT
Condition
Tester connection
Specified condition
Always
1 – 2
Continuity
Always
3 – 5
No continuity
Apply B+ between
terminals 1 and 2.
3 – 5
Continuity
If continuity is not as specified, replace the relay.