Displaying Sensor Inputs at the Climate Control Unit

The climate control unit has a mode that displays sensor inputs it receives. This mode shows you what the climate control unit is receiving from each of the sensors, one at a time, and it can help you determine if a sensor is faulty.

Check these items before using the sensor input display mode: 

1. Turn the ignition switch ON (II), and check the recirculation door function; press the recirculation button to switch from FRESH to RECIRC. The air volume and sound should change slightly.
2. Set the temperature control knob to the desired test temperature. When selecting the test temperatures, note these items:
   • "Lo" temperature setting will default to MAX COOL, VENT, and RECIRC.
   • "Hi" temperature setting will default to MAX HOT, FLOOR, and FRESH.
   • 58 through 86°F settings will use the automatic climate control logic.
3. Turn the ignition switch OFF.

To run the sensor input display mode, follow these steps: 

1. Turn the ignition switch OFF.
2. Press and hold both the AUTO and RECIRC buttons, then start the engine.
3. After the engine starts, release the buttons. The climate control display will flash the sensor number and then the value for that sensor. Record the value displayed.
4. To advance to the next sensor, press the rear window defogger button.
   ITEMS DISPLAYED VALUE REFERENCE
   
   

   Sensor	Item	Displayed Value
   1	In-car Temperature Sensor	°C
   2	Outside Air Temperature Sensor	°C
   3	Solar Radiation Sensor Value: Dark = 00, Flashlight = 04, Cloudy = 10, Sunny = 65	10 kcal/m2 .h
   4	Engine Coolant Temperature	°C
   5	Evaporator Outlet Air Temperature	°C
   6	Air Mix Opening (Low value indicates cooler air distribution, higher value indicates warmer air distribution)	% of opening
   7	Vent Temperature Air Out (TAO)	°C
   8	Vehicle Speed (Vehicle must be driven to display speed)	km/h

   NOTE:

   • The sensor values will be displayed in degrees Celsius (°C) or an alphanumeric code. Use CELSIUS TO FAHRENHEIT CONVERSION TABLE  to convert the value to degrees Fahrenheit (°F).
   • If the sensor value displays "Er," this indicates there is an open or short in the circuit or sensor. Run the self-diagnostic function to check for a DTC.
   • If necessary, compare the sensor input display to an alike, known-good vehicle under the same test conditions.
   • If the sensor is out of the normal range, refer to the sensor test, or substitute the sensor with a known-good sensor, and recheck.
5. To cancel the sensor input display mode, press the AUTO button, or turn the ignition OFF.

   Celsius to Fahrenheit Conversion Table 

   CELSIUS TO FAHRENHEIT CONVERSION TABLE
   
   

   °C	°F	°C	°F	°C	°F	°C	°F	°C	°F
   0	32	10	50	20	68	30	86	40	104
   1	34	11	52	21	70	31	88	41	106
   2	36	12	54	22	72	32	90	42	108
   3	37	13	55	23	73	33	91	43	109
   4	39	14	57	24	75	34	93	44	111
   5	41	15	59	25	77	35	95	45	113
   6	43	16	61	26	79	36	97	46	115
   7	45	17	63	27	81	37	99	47	117
   8	46	18	64	28	82	38	100	48	118
   9	48	19	66	29	84	39	102	49	120

   Celsius to Fahrenheit Conversion Table 

   CELSIUS TO FAHRENHEIT CONVERSION TABLE
   
   

   °C	°F	°C	°F	°C	°F	°C	°F	°C	°F
   50	122	60	140	70	158	80	176	90	194
   51	124	61	142	71	160	81	178	91	196
   52	126	62	144	72	162	82	180	92	198
   53	127	63	145	73	163	83	181	93	199
   54	128	64	147	74	165	84	183	94	201
   55	131	65	149	75	167	85	185	95	203
   56	133	66	151	76	169	86	187	96	205
   57	135	67	152	77	170	87	188	97	207
   58	136	68	154	78	172	88	190	98	208
   59	139	69	158	79	174	89	192	99	210

   Alphanumeric Conversion Table 

   ALPHANUMERIC CONVERSION TABLE
   
   

   Display Reading (Alphanumeric)	°C	°F	%
   A1 thru A9	-1 thru -9	30 thru 16	-1 thru -9
   B0 thru B9	-10 thru -19	14 thru -2	-10 thru -19
   C0 thru C9	-20 thru -29	-4 thru -20	-20 thru -29
   D0 thru D9	-30 thru -39	-22 thru -38	-30 thru -39
   E0 thru E9	-40 thru -49	-40 thru -58	-
   F0 thru F9	-50 thru -59	-58 thru -74	+100 thru +109