Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2004 Mazda RX8 2RTR-1.3LFACTORY OEM SERVICE PROCEDURE
Control Assembly: Testing and Inspection
CLIMATE CONTROL UNIT INSPECTION
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 1 Up and 1 R
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 given table
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 given table.
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 given table
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.
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 1 Up and 1 R
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 given table
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 given table.
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 given table
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.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.