S13 Service ManualS13

Torque Specs Tools Parts Diagrams

TROUBLE DIAGNOSES — Main Power Supply and Ground Circuit Check (Power supply circuit + Thermo control amp.)

HA-65prose procedure

Connector M9 = thermo control amp.; pin 34 = L/OR power feed; pin 13 = LG/B ground.

Continued from HA-64

Main Power Supply and Ground Circuit Check

POWER SUPPLY CIRCUIT CHECK FOR A/C SYSTEM

NOTE

Check power supply circuit for air conditioning system. Refer to "POWER SUPPLY ROUTING" in EL section and A/C ELECTRICAL CIRCUIT.

THERMO CONTROL AMP. CHECK

Power-supply circuit check (with ignition switch ON)

1
Disconnect thermo control amp. harness connector.
2
Connect voltmeter from harness side.
3
Measure voltage across terminal No. 34 and body ground.

Voltmeter readings — terminal 34 vs body ground

Voltmeter terminal (+)	Voltmeter terminal (−)	Voltage
34	Body ground	Approx. 12V

34

Voltmeter terminal (−)Body ground

VoltageApprox. 12V

Body-ground circuit check (with ignition OFF, A/C ON, fan ON)

1
Disconnect thermo control amp. harness connector.
2
Connect ohmmeter from harness side.
3
Check for continuity between terminal No. 13 and body ground.

Ohmmeter readings — terminal 13 vs body ground

Ohmmeter terminal (+)	Ohmmeter terminal (−)	Continuity
13	Body ground	Yes

13

Ohmmeter terminal (−)Body ground

ContinuityYes

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See also

EL HA-52A/C ELECTRICAL CIRCUIT — Wiring Diagram (L.H.D. Model)HA-53A/C ELECTRICAL CIRCUIT — Wiring Diagram (Cont'd) — interior side HA-54A/C ELECTRICAL CIRCUIT — Wiring Diagram (Cont'd) — R.H.D. Model engine-room side HA-55A/C ELECTRICAL CIRCUIT — Wiring Diagram (Cont'd) — R.H.D. interior side