#
CLIMATE CONTROL UNIT INSPECTION

BHE074061190W02

## On-board Diagnostic Test Procedure

1. Disconnect the negative battery cable.

2. Remove the A/C amplifier.

3. Disconnect the A/C amplifier connector (24-pin).

4. Using a jumper wire or a similar device, short circuit A/C amplifier connector (24-pin) terminals 1P and 1R.

5. Connect the negative battery cable.

6. Turn the ignition switch to the ON position (engine off).

## Output Signal Inspection

1. After performing the on-board diagnostic test procedure, inspect according to the following table:

INSPECTION | DISPLAY | ACTION
--- | --- | ---
Inspect the climate control switch indicator lights. |  | All indicator lights illuminate. | Output signal from the audio unit is normal.
Except above | Replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.)

2. Disconnect the jumper wire or the similar device connected to the A/C amplifier connector (24-pin) to exit the on-board diagnostic test function.

## Switch Inspection

1. After performing the on-board diagnostic test procedure, turn on the audio.

2. Inspect according to the following table:

STEP | INSPECTION | ACTION
--- | --- | ---
1 | Press each mode switch of the climate control unit. | The buzzer sounds. | The switch is normal.
The buzzer does not sound. | Go to the next step.
2 | Inspect the audio buttons by referring to the diagnostic assist function in the on-board diagnostic system [audio]. | The buzzer sounds. | Replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.)
The buzzer does not sound. | Replace the base unit.

3. Disconnect the jumper wire or the similar device connected to the A/C amplifier connector (24-pin) to exit the on-board diagnostic test function.

## Temperature Control Dial Inspection

1. After performing the on-board diagnostic test procedure, turn on the audio.

2. Press the audio POWER and SCAN (upper) buttons simultaneously.

3. "A/C TEMP--" is displayed on the information display.

4. Inspect according to the following table:

INSPECTION | DISPLAY | ACTION
--- | --- | ---
Turn the temperature control dial. |  | Does the numeral on the information display change from 0 to 16? | The temperature control dial is normal.
Except above | Replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.)

5. Disconnect the jumper wire or the similar device connected to the A/C amplifier connector (24-pin) to exit the on-board diagnostic test function.