TROUBLE DIAGNOSES — Diagnostic Procedure 1 (Cont'd) — Resistor + Fan switch checks
HA-71flowchartBranches A→ (from HA-70) and B/C/D/E (single-speed flows) merge here at the resistor check. Step-E voltage table maps each flow chart number to its terminal pin.
Diagnostic Procedure 1 (Cont'd)
Diagnostic Procedure 1 (Cont'd) — resistor + fan-switch circuit
1
[A→]→ CHECK RESISTOR AFTER DISCONNECTING IT. (Refer to Electrical Components Inspection.)
N.G.
Replace resistor.
O.K.
2
Reconnect resistor harness connector.
3
[E] CHECK FAN SWITCH CIRCUIT. Do approx. 12 volts exist between each fan switch harness terminal and body ground? (per flow-chart number)
N.G.
Note → Check circuit continuity between fan switch and resistor.
O.K.
4
CHECK FAN SWITCH AFTER DISCONNECTING IT. (Refer to Electrical Components Inspection.)
N.G.
Replace fan switch.
O.K.
5
[F] Check circuit continuity between fan switch harness terminal No. 23 and body ground.
O.K.
6
Replace blower motor.
Step E — voltmeter terminals per flow-chart number
2
Voltmeter (+) terminal27
Voltmeter (−) terminalBody ground
VoltageApprox. 12V
3
Voltmeter (+) terminal26
Voltmeter (−) terminalBody ground
VoltageApprox. 12V
4
Voltmeter (+) terminal25
Voltmeter (−) terminalBody ground
VoltageApprox. 12V
5
Voltmeter (+) terminal24
Voltmeter (−) terminalBody ground
VoltageApprox. 12V
NOTE
If the result is N.G. after checking circuit continuity, repair harness or connector.