To access the diagnostic codes, hold down the auto and recirc/fresh air buttons at the same time while turning the ignition to on.
You’ll see that all indicator lights and LCD elements should flash four times followed by any problem codes.
From the Manual:
TROUBLE SHOOTING
SELF-DIAGNOSTICS
An Electronic Control Unit (ECU) within A/C-heater control
panel monitors system circuits and stores trouble codes in memory if
problems are detected. All codes, except Codes 22 and 23, are stored
in memory. Malfunction is current if Code 22 or 23 is displayed. To
retrieve stored codes, see RETRIEVING CODES. Codes are displayed at
temperature display. See Fig. 2.
RETRIEVING CODES
1) Simultaneously press and hold AUTO and recirculated air
switches. See Fig. 2. Turn ignition on. All indicators will flash 4
times, at one-second intervals. Tone will sound when indicators flash.
2) A/C system will enter self-diagnostic mode. To end
indicator check, press and release OFF switch. Read codes at
temperature display.
3) If trouble code is displayed, proceed to appropriate
trouble shooting procedure. See DIAGNOSTIC CODE IDENTIFICATION table.
Codes are displayed in ascending order. To slow rate at which codes
are displayed, press fresh air button to change display to step
operation. Each time fresh air button is pressed, display changes by
one step.
4) If tone sounds as code is displayed, problem currently
exists. If tone does not sound as code is displayed, problem occurred
in past and does not presently exist.
Code Diagnosis
00 ………………………………………… Normal
11 (1) …………. In-Vehicle Temperature Sensor Circuit
12 (2) ……………. Ambient Temperature Sensor Circuit
13 …………….. Evaporator Temperature Sensor Circuit
14 ……………….. Coolant Temperature Sensor Circuit
21 (3) ………………………… Solar Sensor Circuit
22 (4) ……………….. Compressor Lock Sensor Circuit
23 (4) ……………………… Pressure Switch Circuit
31 ……………… Air Mix Door Position Sensor Circuit
32 ……………. Air Inlet Door Position Sensor Circuit
33 …………… Air Outlet Door Position Sensor Circuit
41 ………………….. Air Mix Door Servomotor Circuit
42 ………………… Air Inlet Door Servomotor Circuit
43 ……………….. Air Outlet Door Servomotor Circuit
(1) – If in-vehicle temperature is -4 F (-20 C) or less,
Code 11 may set even though system is normal.
(2) – If outside air temperature is -58 F (-50 C) or less,
Code 12 may occur set though system is normal.
(3) – If testing is done in a dark area, Code 21 may set
even though system is normal. Shine a light at solar
sensor and recheck codes.
(4) – Malfunction is current. Code is not stored in memory.
ACTUATOR CHECK
1) Perform step 1) of RETRIEVING CODES. When system enters
self-diagnostic mode, press recirculated air button. Each mode door,
motor, and relay will operate at one-second intervals. Press fresh air
button to display codes one at a time, and perform step-by-step
actuator check.
2) Check airflow and temperature by hand. Tone will sound
each time display code changes. Each display code is associated with a
system operating condition. See Fig. 3 or 4. Press OFF button to
cancel actuator check mode.
I think I am reading this right. I cannot find a code definition for code 31. my problems are a/c compressor is not kicking on but I have full voltage to the compressor, the front blower is not coming on at any speed, when I disconnect and send voltage it does run. it appears I am getting a solid GROUND to the fan when it is connected. What is code 31. I also believe that the compressor is bad. any advice?
If you are getting battery voltage (positive and negative) to the Air Conditioning compressor and the clutch is not pulling in, the Compressor Clutch is shot. Generally the entire compressor is replaced at this point.
Code 31 Abnormal air mix servo-motor potentiometer output voltage ( Air Mix Door Position Sensor Circuit)
awesome!!! Them 2 problems are repaired. I still have not repaired the front blower motor. I have put 10 amps direct to the blower and works fine. through the circuit I get nothing, not even on high. the switch and the display seem to work properly. all four wires at the resistor are showing ground, however one of the tiny wires shows a an intermittent ground the pulses faster as you turn up the blower switch. The rear blower works fine. any idea???
To access the diagnostic codes, hold down the auto and recirc/fresh air buttons at the same time while turning the ignition to on.
You’ll see that all indicator lights and LCD elements should flash four times followed by any problem codes.
From the Manual:
TROUBLE SHOOTING
SELF-DIAGNOSTICS
An Electronic Control Unit (ECU) within A/C-heater control
panel monitors system circuits and stores trouble codes in memory if
problems are detected. All codes, except Codes 22 and 23, are stored
in memory. Malfunction is current if Code 22 or 23 is displayed. To
retrieve stored codes, see RETRIEVING CODES. Codes are displayed at
temperature display. See Fig. 2.
RETRIEVING CODES
1) Simultaneously press and hold AUTO and recirculated air
switches. See Fig. 2. Turn ignition on. All indicators will flash 4
times, at one-second intervals. Tone will sound when indicators flash.
2) A/C system will enter self-diagnostic mode. To end
indicator check, press and release OFF switch. Read codes at
temperature display.
3) If trouble code is displayed, proceed to appropriate
trouble shooting procedure. See DIAGNOSTIC CODE IDENTIFICATION table.
Codes are displayed in ascending order. To slow rate at which codes
are displayed, press fresh air button to change display to step
operation. Each time fresh air button is pressed, display changes by
one step.
4) If tone sounds as code is displayed, problem currently
exists. If tone does not sound as code is displayed, problem occurred
in past and does not presently exist.
Code Diagnosis
00 ………………………………………… Normal
11 (1) …………. In-Vehicle Temperature Sensor Circuit
12 (2) ……………. Ambient Temperature Sensor Circuit
13 …………….. Evaporator Temperature Sensor Circuit
14 ……………….. Coolant Temperature Sensor Circuit
21 (3) ………………………… Solar Sensor Circuit
22 (4) ……………….. Compressor Lock Sensor Circuit
23 (4) ……………………… Pressure Switch Circuit
31 ……………… Air Mix Door Position Sensor Circuit
32 ……………. Air Inlet Door Position Sensor Circuit
33 …………… Air Outlet Door Position Sensor Circuit
41 ………………….. Air Mix Door Servomotor Circuit
42 ………………… Air Inlet Door Servomotor Circuit
43 ……………….. Air Outlet Door Servomotor Circuit
(1) – If in-vehicle temperature is -4 F (-20 C) or less,
Code 11 may set even though system is normal.
(2) – If outside air temperature is -58 F (-50 C) or less,
Code 12 may occur set though system is normal.
(3) – If testing is done in a dark area, Code 21 may set
even though system is normal. Shine a light at solar
sensor and recheck codes.
(4) – Malfunction is current. Code is not stored in memory.
ACTUATOR CHECK
1) Perform step 1) of RETRIEVING CODES. When system enters
self-diagnostic mode, press recirculated air button. Each mode door,
motor, and relay will operate at one-second intervals. Press fresh air
button to display codes one at a time, and perform step-by-step
actuator check.
2) Check airflow and temperature by hand. Tone will sound
each time display code changes. Each display code is associated with a
system operating condition. See Fig. 3 or 4. Press OFF button to
cancel actuator check mode.
I think I am reading this right. I cannot find a code definition for code 31. my problems are a/c compressor is not kicking on but I have full voltage to the compressor, the front blower is not coming on at any speed, when I disconnect and send voltage it does run. it appears I am getting a solid GROUND to the fan when it is connected. What is code 31. I also believe that the compressor is bad. any advice?
If you are getting battery voltage (positive and negative) to the Air Conditioning compressor and the clutch is not pulling in, the Compressor Clutch is shot. Generally the entire compressor is replaced at this point.
Code 31 Abnormal air mix servo-motor potentiometer output voltage ( Air Mix Door Position Sensor Circuit)
Step by Step Air Conditioning Troubleshooting
awesome!!! Them 2 problems are repaired. I still have not repaired the front blower motor. I have put 10 amps direct to the blower and works fine. through the circuit I get nothing, not even on high. the switch and the display seem to work properly. all four wires at the resistor are showing ground, however one of the tiny wires shows a an intermittent ground the pulses faster as you turn up the blower switch. The rear blower works fine. any idea???
Thank You for the Donation!
You should see battery voltage on Blk/Blu wire. Looks like the voltage comes from the HTR fuse 50amp.
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