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HAIMA 7 Service Manual(MT)-U Heater and air conditioning system

Troubleshooting

Troubleshooting Troubleshooting procedure Step Inspection Action 1 Inspect whether malfunction is in a/c system or defrost system • Does cold air blow out when switch on both a/c and fan of front climate control unit. Yes No Go to next step. Go to step 1 of troubleshooting index no. 11. 2 Inspect a/c fuse • Is a/c fuse normally connected? Yes Go to next step. No • Inspect blown fuse circuit for short to ground. — Repair or replace as necessary. — Install fuse with appropriate rating. 3 Inspect air intake actuator • Inspect following items of air intake actuator. — Is there any grease on the links? — Is link firmly and properly installed in position? — Is link free of obstructions? • Are all above items normal? *4 Inspect wiring harness between fuse block and front climate control unit for continuity. • Turn ignition switch to on position. • Disconnect climate control unit connector (12-pin) • Measure the voltage at climate control unit connector (air intake module control 12-pin) — Terminal b (ig2 signal) • Is voltage close to b+ (positive battery voltage)? Yes No Yes No Go to next step. Apply grease or install link properly and firmly, remove obstruction, and then go to step 15. Go to next step. Repair wiring harness between fuse block and climate control unit, and then go to step 15. 5 Verify whether malfunction is in air intake port of blower assembly or elsewhere. • Does air intake actuator link alternates repeatedly between fresh and ecir mode? Yes Go to next step. No Go to step 8. 6 Inspect air intake actuator • Inspect air intake actuator (see u-29, air intake actuator inspection) • Is it normal? 7 Inspect wiring harness between front climate control unit and air intake actuator for short circuit to ground. Yes No Yes Go to next step. Replace air intake actuator, and then go to step 15. Repair wiring harness between front climate control unit and air intake actuator, and then go to step 15. U-18

Troubleshotting Step Inspection Action • Turn ignition switch to lock position. • Does one of climate control unit connector (6-pin for air intake mode) terminals below short to ground? — Terminal c (fresh signal) — Terminal e (recirculate signal) No Replace climate control unit, and then go to step 15. 8 Verify whether malfunction is in air intake actuator or air intake control valve of blower assembly. • Remove air intake actuator. • Turn ignition switch to on position. • Set fan switch at 4th position. • Can air intake mode (recirculate fresh) be changed easily when air intake link is operated manually? Yes Go to next step. No Go to step 13. 9 Inspect air intake actuator • Inspect air intake actuator (see u-32, air intake actuator inspection) • Is it normal? *10 Inspect continuity of wiring harness between front climate control unit and air intake actuator. • Turn ignition switch to lock position. • Is there continuity between following front climate control unit connector (12-pin for air intake mode) terminals and air intake actuator connector terminals? — Terminal c- terminal c (fresh signal) — Terminal e- terminal a (recirculate signal) *11 Inspect wiring harness between front climate control unit and air intake actuator for short circuit to ground. • Is there continuity between following front climate control unit connector (12-pin for air intake mode) terminals and ground? — Terminal c (fresh signal) — Terminal e (recirculate signal) *12 Verify whether malfunction is in wiring harness (the harness b+ (positive battery voltage) between front climate control unit Yes No Yes No Yes No Yes Go to next step. Replace air intake actuator, then go to step 15. Go to next step. Repair wiring harness between front climate control unit and air intake actuator, then go to step 15. Repair wiring harness between front climate control unit and air intake actuator, then go to step 15. Go to next step. Repair wiring harness between front climate control unit and air intake actuator, turn to step 15. U-19

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