A/C Codes - What parts do I need?
#1
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My A/C fan stopped working, along with my heater, vent, and window defroster. I checked the codes on the ECU, and never heard a sound on any of the codes, but got codes 21, 33, & 43. When my fan is hard wired with power (a friend checked this when he checked my fuses), the fan will work and the A/C will blow as normal.
Can someone please let me know what parts I need to replace, and how simple or hard this repair should be?
Thanks sooo much!
Can someone please let me know what parts I need to replace, and how simple or hard this repair should be?
Thanks sooo much!
#2
Lexus Test Driver
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Before you go to far down the troubleshooting road, try pulling the negative battery cable for a few minutes. Being that the RX uses so much electronics, sometimes just resetting them gets things working.
#3
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Welcome to the Club.
I can't help you much on tell you which parts, because there are some testing methods you would need to go through to pinpoint exactly which areas to check. In the 2 volume service manual, volume 1 has a section toward the end of the book about this. I highly recommend getting this if you plan to do further DIY work on your vehicle.
However, I will go over the codes for you here.
21
Solar sensor circuit
Trouble Areas:
1. Solar sensor
2. Harness or connector between solar sensor and A/C ECU (Combination Meter ECU)
3. A/C ECU (Combination Meter ECU)
33
Air outlet damper position sensor circuit
Trouble Areas:
1. Air inlet damper position sensor circuit
2. A/C ECU (Combination Meter ECU)
3. Harness or connector between air inlet damper position sensor and A/C ECU (Combinatin Meter ECU)
43
Air outlet damper control servomotor circuit
Trouble Areas:
1. Air outlet damper control servomotor
2. Air outlet damper position sensor
3. Harness and connector between A/C ECU (Combination Meter ECU) and air outlet position sensor
4. Harness and connector between A/C ECU (Combination Meter ECU) and air outlet servomotor
5. A/C ECU (Combination Meter ECU)
I can't help you much on tell you which parts, because there are some testing methods you would need to go through to pinpoint exactly which areas to check. In the 2 volume service manual, volume 1 has a section toward the end of the book about this. I highly recommend getting this if you plan to do further DIY work on your vehicle.
However, I will go over the codes for you here.
21
Solar sensor circuit
Trouble Areas:
1. Solar sensor
2. Harness or connector between solar sensor and A/C ECU (Combination Meter ECU)
3. A/C ECU (Combination Meter ECU)
33
Air outlet damper position sensor circuit
Trouble Areas:
1. Air inlet damper position sensor circuit
2. A/C ECU (Combination Meter ECU)
3. Harness or connector between air inlet damper position sensor and A/C ECU (Combinatin Meter ECU)
43
Air outlet damper control servomotor circuit
Trouble Areas:
1. Air outlet damper control servomotor
2. Air outlet damper position sensor
3. Harness and connector between A/C ECU (Combination Meter ECU) and air outlet position sensor
4. Harness and connector between A/C ECU (Combination Meter ECU) and air outlet servomotor
5. A/C ECU (Combination Meter ECU)
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