TROUBLE DIAGNOSES — Diagnostic Procedure 1 (Cont'd)
HA-46flowchartFlowchart shows the per-speed terminal map: speed 2 → terminal 27, speed 3 → 26, speed 4 → 25, speed 5 → 24. Terminal 24 on fan switch routes the 4-speed (highest) line directly without the resistor.
Diagnostic Procedure 1 (Cont'd)
Blower motor does not rotate — continuation (branches B/C/D/E)
1
B — From previous page (incident 2: fan does not rotate at 1-speed).
2
2
CHECK RESISTOR AFTER DISCONNECTING IT.
N.G.
Replace resistor.
O.K.
3
Reconnect resistor harness connector.
4
CHECK FRONT FAN SWITCH CIRCUIT. Do approx. 12 volts exist between each fan switch harness terminal and body ground?
O.K.
return to step 6
N.G.
5
G — Check circuit continuity between fan switch and resistor.
Note
6
CHECK FAN SWITCH AFTER DISCONNECTING IT.
N.G.
Replace fan switch.
O.K.
7
F — Check circuit continuity between fan switch harness terminal No. 23 and body ground.
O.K.
8
Replace blower motor.
Fan switch — terminal-by-flow-chart voltage check
2
Terminal No. (+)27
Terminal No. (−)Body ground
VoltageApprox. 12 V
3
Terminal No. (+)26
Terminal No. (−)Body ground
VoltageApprox. 12 V
4
Terminal No. (+)25
Terminal No. (−)Body ground
VoltageApprox. 12 V
5
Terminal No. (+)24
Terminal No. (−)Body ground
VoltageApprox. 12 V
NOTE
If the result is N.G. after checking circuit continuity, repair harness or connector.