B15: CHECK THE GROUND SUPPLY OF THE RELAY – A/C SWITCH.............. 412-00-16
B16: CHECK THE RELAY – A/C SWITCH............................................................412-00-16/17
B17: CHECK THE A/C COMPRESSOR CYCLING SWITCH ............................... 412-00-17
B18: CHECK THE CIRCUIT 31S-CA17 (BK/RD) FOR OPEN .............................. 412-00-17/18
B19: CHECK CIRCUIT 31S-PC72 (BK/BU) FOR OPEN....................................... 412-00-18
B20: CHECK THE CIRCUIT 31S-CA11 (BK/YE) FOR OPEN............................... 412-00-18/19
B21: CHECK THE CIRCUIT 31S-CA12A (BK/BU) FOR OPEN ............................ 412-00-19
B22: CHECK THE DUAL PRESSURE SWITCH................................................... 412-00-19
B23: CHECK THE CIRCUIT 31S-CA12 (BK/BU) FOR OPEN............................... 412-00-20
B24: CHECK THE A/C INHIBIT DIODE................................................................ 412-00-20
PINPOINT TEST C: THE HEATER BLOWER SYSTEM IS INOPERATIVE
C1: DETERMINE THE FAULT CONDITION......................................................... 412-00-20
C2: CHECK THE FUSE F16 ................................................................................ 412-00-21
C3: CHECK THE POWER SUPPLY OF THE FUSE F16 ..................................... 412-00-21
C4: CHECK THE POWER SUPPLY OF THE HEATER BLOWER MOTOR......... 412-00-21
C5: CHECK THE HEATER BLOWER MOTOR.................................................... 412-00-22
C6: CHECK THE CIRCUIT 31S-CA18 (BK/RD) FOR OPEN ................................ 412-00-22
C7: CHECK THE GROUND SUPPLY OF THE HEATER BLOWER SWITCH ...... 412-00-23
C8: CHECK THE CIRCUIT FOR HEATER BLOWER, HIGH SPEED................... 412-00-23
C9: CHECK THE CIRCUIT FOR HEATER BLOWER, MEDIUM SPEED.............. 412-00-23
C10: CHECK THE COMMON CIRCUIT FOR HEATER BLOWER;
LOWER SPEEDS................................................................................................ 412-00-24
C11: CHECK THE CIRCUIT FOR HEATER BLOWER, MEDIUM SPEED............ 412-00-24
C12: CHECK THE CIRCUIT FOR HEATER BLOWER, LOW SPEED.................. 412-00-25
C13: CHECK THE CIRCUIT FOR HEATER BLOWER, LOW SPEED.................. 412-00-25
C14: CHECK THE CIRCUIT FOR HEATER BLOWER, SLOW SPEED ............... 412-00-26
C15: CHECK THE CIRCUIT FOR HEATER BLOWER, SLOW SPEED ............... 412-00-26
PINPOINT TEST D: THE AIR RE-CIRCULATION FLAP IS INOPERATIVE
D1: CHECK THE FUSE F16 ................................................................................ 412-00-26
D2: CHECK THE POWER SUPPLY OF THE FUSE F16 ..................................... 412-00-27
D3: CHECK THE FUSE F13 ................................................................................ 412-00-27
D4: CHECK THE POWER SUPPLY OF THE FUSE F13 ..................................... 412-00-27
D5: CHECK THE POWER SUPPLY OF THE RE-CIRCULATION
AIR ACTUATOR.................................................................................................. 412-00-28
D6: CHECK THE GROUND SUPPLY OF THE RE-CIRCULATION
AIR ACTUATOR.................................................................................................. 412-00-28
PAGE 2 OF 3
System Checks
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