For 1990-2009 cars

Step | Action | Values | Yes | No
--- | --- | --- | --- | ---
1 |

1. Turn ON the ignition.
2. Observe the temperature indication screen of the controller.

Does the digit flash?

--

Go to Step 2

Go to Step 3

2 | Run a self-diagnosis circuit check. Does the display indicate a defect code? | -- | Go to appropriate DTC table | --
3 |

1. Turn ON the ignition.
2. Measure the voltage between ground and terminal 2 of the blower motor.

Does the voltage measure within the specified value?

11-14 V

Go to Step 4

Go to Step 5

4 | Measure the voltage between ground and terminal B12 at the ACT switch. Does the voltage measure within the specified value? | 11-14 V | Go to Step 6 | Go to Step 12
5 | Repair any problem found in terminal 2 at the blower motor circuit or ground G203. Did you complete the repair? | -- | System OK | --
6 | Measure the resistance between the connector terminals on the blower motor. Does the resistance measure equal to the specified value? | 5 ohms | Go to Step 8 | Go to Step 7
7 | Replace the blower motor. Did you complete the repair? | -- | System OK | --
8 |

1. Turn OFF the ignition.
2. Using an ohmmeter, measure the resistance between terminal 1 of the blower motor and terminal 2 of the power transistor.

Does the resistance measure equal to the specified value?

0 ohms

Go to Step 10

Go to Step 9

9 | Repair the circuit between terminal 1 of the blower motor and terminal 2 of the power transistor. Did you complete the repair? | -- | System OK | --
10 | Measure the resistance between terminal 2 of the power transistor connector to ground Does the resistance measure equal to the specified value? | 0 ohms | Go to Step 11 | Go to Step 12
11 |

1. Trace the circuit from terminal 2 of the power transistor connector to ground G203.
2. Repair any problem found in the circuit to ground G203.

Did you complete the repair?

--

System OK

--

12 | Replace the ATC controller. Did you complete the repair? | -- | System OK | --