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.

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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 555 (AIR CONDITIONING SYSTEM - DIAGNOSTICS)PRE-CHECK

2004 Toyota Matrix XR, FWD, Standard

Section 555 (Air Conditioning System - Diagnostics): Pre-Check

2004 Toyota Matrix XR, FWD, StandardSECTION Pre-Check

WARNING: This page is about a different car, the 2003 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.

WARNING FOR A/C COMPRESSOR LOCK
If compressor lock occurs during A/C operation, the A/C switch indicator on the A/C control assembly starts blinking.

When this occurs, check for compressor lock (DTC 22) using diagnosis trouble code check then proceed to inspect the circuit or the component.

Compressor lock sensor circuit. --> (See DTC 22 COMPRESSOR LOCK SENSOR CIRCUIT )

Fig 1: Identifying A/C Switch Indicator On A/C Control Assembly Blinking Pattern
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LIST OF OPERATION METHODS
By operating each of the A/C control switches as shown in the diagram below, it is possible to enter the diagnosis check mode.

Fig 2: Operation Methods Flowchart
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INDICATOR CHECK
1. Turn the ignition switch to on while pressing the A/C control AUTO switch and R/F SW simultaneously.
  
  Fig 3: Identifying A/C Control Auto Switch And R/F SW
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2. Check that all the indicators light up and go off at 1 second intervals 4 times in succession.
NOTE:
- After the indicator check is ended, the diagnostic trouble code check begins automatically.
- Press the OFF switch when desiring to cancel the check mode.
DTC CHECK (SENSOR CHECK)
1. Perform an indicator check. After the indicator check is completed, the system enters the DTC check mode automatically.
2. Read the DTC displayed on the panel. Refer to the list of DTCs in DIAGNOSTIC TROUBLE CODE CHART when reading the DTCs (DTCs are out put at the temperature display.).
  If the slower display is desired, press the DEF. SW and change it to step operation. Each time the Temp. Control switch is pressed, the display changes by 1 step.
Fig 6: Identifying DEF Switch
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CLEARING DTC
1. Pull out the DOME fuse in engine room J/B for 10 sec. or longer to clear diagnostic the DTC's memory.
2. After reinserting the fuse, check that the normal code is output.
Fig 7: Locating DOME Fuse In Engine Room J/B
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CHECK DLC3
The vehicle's ECM uses the ISO 9141-2 communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.

Fig 8: Identifying DLC3 Terminals
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