tach in the climate control? -- old sticky

[thebigbadWOLF]

Program Info for Automatic Climate Control

Readout Settings -
-06 tach
-08 coolant temp (°F)
-14 speed (MPH)
-24 coolant temp (°C)

Instructions for putting ACC in diagnostic mode -
- turn ignition to ON position (or start vehicle)
- press and hold the temp up and OFF buttons at the same time until the unit does a full segment check.
- Release the buttons.
- Display should read -00... you are now in diagnostic mode
- Using the fan up/down buttons, select desired function from above
- press middle

Have fun!
__________________
Mike

LRRS
(LongRoof Rehabilitation and Retirement Services)
Mid-Atlantic Division

ISSCA #193, WAIL
Mike's Garage

http://www.reteaparty.com/

[RoadMonster 2.0]

The climate control actually has even more data available than the items shown.

I keep a printout in the glovebox.

It was VERY useful having the speedometer function when calibrating my new speedometer

[thebigbadWOLF]

i can only recover this also :


I've wanted to get a list together to see all of the ones we know/figured out

Here are the ones I know of:

-02 HVAC Trouble Codes
-05 Program #
-06 Tachometer (RPMs / 100)
-07 Commanded Blower Speed (0-128)
-08 Coolant Temp (°F)
-14 Vehicle Speed (MPH)
-15 Temp Cal Offset
-18 Sun Load Sensor
-20 Current Temp Valve Position
-22 Temp Valve Position @ Cold
-23 Temp Valve Position @ Hot
-24 Coolant Temp (°C)
-25 Commanded Temp Valve Position
-27 Air Delivery Mode
-28 Inside Air Temp (0-255 where 128=75°F)
-31 Outside Air Temp (0-255 where 128=49°F)
-37 EEPROM Revision #

Now some of these require special proceedures to adjust, so if you mess them up, don't whine to me. You should be able to view them, but don't experiment with pushing other buttons on the CC as some of them have other functions.

If anyone else knows any more, please add a post and I will add them to the list for reference.

[thebigbadWOLF]

i cant get anything deeper then the 1st page.

[Jim Rockford]

Well it use to be old news before the crash, I guess whats old is really new now.

[Goldmaster]

From our sticky at buickforums.com.....

Did you know that you can access your Engine(and other) trouble codes thru the Climate Control? Did you also know that you can accurately monitor the engine RPM, vehicle speed, coolant temp, and others? If so, good job! If not, look at this!

This is for 94-96's!!

*Please note, some of this was info copied directly from ISSF.



Instructions for putting ACC in diagnostic mode -
- turn ignition to ON position (or start vehicle)
- press and hold the "temp up" and "OFF" buttons at the same time until the unit does a full segment check.
- Release the buttons.
- Display should read -00... you are now in diagnostic mode
- Using the fan up/down buttons, select desired function from above
- press the "middle" Button. It should be in the top right corner on the CC.
- To Exit the trouble code area, and go back to the -00 display, hit the "Middle" button again.

Have fun!

You will see -00. You can change the funtion(it will say -01, -02, etc) with the fan up, and down buttons. Here is a list of what all the -00 numbers mean.


Here are the most common you will need to know

-00 PCM diagnostics codes
-01 CCM Diagnostic trouble codes
-02 HVAC Diagnostic trouble codes
-03 SIR Diagnostic trouble codes
-04 ABS/TC Diagnostic trouble codes
-06 Engine RPM
-08 Coolant Temp (°F) - Reading taken at Cylinder head sensor, typically 20* cooler than the -24 reading
-14 Vehicle speed
-24 Coolant Temp (°C) - Reading taken at the Water Pump sensor, This is what the PCM uses to control the fans.



Diagnostic Pointers and Parameters

No. Description Range Default Value Units


-00 PCM System Diagnostic ...............................................
-01 CCM System Diagnostic Trouble Codes ...............................................
-02 ACAC (HVAC) System Diagnostic Trouble Codes .......................................
-03 SIRSystem Diagnostic Trouble Codes ................................................
-04 ABS/TC System Diagnostic Trouble Codes ............................................
-05 Program number .......................... 0-255 ....... n/a ............. Counts
-07 Command Blower Motor Speed .............. 0-128 ....... n/a ............. Counts
-14 Vehicle speed ........................... 0-199 ....... n/a ................ MPH
-15 HVAC Learn Mode (Temp Cal) .............. -5 to +5 F .. 0 F ............ Degrees
-18 Sun Load Sensor ......................... 0-255 ....... n/a ............. Counts
-20 Current Temperature Valve Position ...... 0-255 ....... 240 ............. Counts
-22 Temperature Valve Position (Full Cold) .. 180-250 ..... 180 ............. Counts
-23 Temperature Valve Position (Full Hot) ... 5-60 ........ 60 .............. Counts
-24 Engine Coolant Temperature .............. -40 to 151 .. n/a ............ Celsius
-25 Command Temperature Valve Position ...... 0-255 ....... 128 ............. Counts
-27 Air Delivery Mode ....................... 0-9 ......... n/a ... Code (see below)
-28 Inside Air Temperature Sensor ........... 0-255 ....... n/a ............. Counts
-31 Outside Air Temperature Sensor .......... 0-255 ....... n/a ............. Counts
-37 EEPROM Revision Number .................. 0-0000 ...... n/a ............... Code

[Goldmaster]

Here is a list of the trouble codes. These were posted for the Fleetwood, so some might be slightly different, or not apply.


PCM diagnostics codes... (-00)

11: malfunction indicator lamp (MIL) circuit
13: Bank 1 (left) heated o2 sensor (open circuit)
14: Engine coolant coolant temperature sensor (siganl voltage low, high tempurature indicated)
15: Engine coolant coolant temperature sensor (siganl voltage high, low tempurature indicated.
16: Distributor ignition system (low resolution pulse)
18: injector circuits.
21: Throttle position sensor TPS circuit (signal voltage high)
22: Throttle position sensor TPS circuit (signal voltage low)
23: Air intake temperature IAT sensor circuit (signal voltage high, low temperature indicated.
24: Vehicle speed sensor (VSS) circuit.
25: Air intake temperature IAT sensor circuit (signal voltage low, high temperature indicated
26: Evaporative emission (EVAP) canister purge solenoid circuit.
27: Exhaust gas recirculation (EGR) vaccum control signal solenoid valve circuit
28: transmission range (TR) pressure switch assembly fault
29: Secondary air injector (AIR) pump circuit.
32: Exhaust gas recirculation (EGR) 1 of 2
33: Manifold absolute Pressure (MAP) sensor circuit (signal voltage high- vacuum low)
34: Manifold absolute Pressure (MAP) sensor circuit (signal voltage low-vacuum high)
36: Distrigutor ignition system (faulty high resolution pulse or extra low resolution pulse detected.)
37: brake switch stuck on
38: brake switch stuck off
41: Ignition control (IC) circuit (open)
42: Ignition control (IC) circuit (shorted or grounded circuit)
43: Knock sensor (KS) circuit
44: Bank 1 (left) heated O2 sensor circuit (lean exhaust indicated)
45: Bank 1 (left) heated O2 sensor circuit (rich exhaust indicated)
46: PASS-key II circuit
47: Knock sensor circuit or control module missing.
48: Mass air flow (MAF) sensor circuit
50: system voltage low
51: EEPROM programming error
53: Sytem voltage high
55: Fuel lean monitor
58: Transmission fluid temp. (TFT) sensor circuit low (High temperature indicated)
59: Transmission fluid temp. (TFT) sensor circuit high (Low temperature indicated)
63: Bank 2 (right) Heated oxygen sensor(HO2S) circuit (open circuit)
64: Bank 2 (right) Heated oxygen sensor(HO2S) circuit (lean exhaust indicated)
65: Bank 2 (right) Heated oxygen sensor(HO2S) circuit (rich exhaust indicated)
66: A/C pressure refrigerant circuit (open or shorted)
67: A/C pressure refrigerant circuit (pressure sensor or A/C clutch circuit problem)
68: A/C relay circuit (shorted circuit)
69: A/C clutch circuit
70: A/C clutch relay driver circuit
72: vehicle speed sensor loss
73: Pressure control solenoind (PCS) circuit (current error)
74: Traction control system (TCS) circuit low
75: Transmission system voltage low
77: Primary cooling fan relay control circuit (not used with V08 option)
78: Secondary cooling fan relay control circuit
79: Trsnsmission fluid overtemp
81: Transmission 2-3 shift solenoid circuit
82: Transmission 1-2 shift solenoid circuit
84: Transmission 3-2 control solenoid circuit
85: Transmission TCC stuck "ON"
90: Transmission TCC solenoid circuit
95: Change oil lamp circuit
96: low oil lamp circuit
97: VSS output circuit

CCM Diagnostic trouble codes (-01)

20: RAP enable circuit (circuit shorted to battery)
21: RAP enable circuit (circuit open or shorted to ground)
22: DIL enable circuit (circuit shorted to battery)
23: DIL enable circuit (circuit open or shorted to ground)
24: Curtesy output circuit (circuit shorted to battery)
25: Curtedy output circuit (circuit open or shorted to ground)
26: VES output circuit (circuit open or shorted to ground)
27: VES output circuit (circuit shorted to battery)
28: VES tracking tracking error (circuit open, shorted to ground, or shorted to battery)
30: "PASS KEY FAULT" telltale circuit (circuit shorted to battery)
31: "PASS KEY FAULT" telltale circuit (circuit open or shorted to ground)
32: Fuel enable circuit (circuit shorted to battery)
33: Fuel enable circuit (circuit open or shorted to ground)
34: Heaflamp enable circuit (circuit shorted to battery)
35: Park lamp enable circuit (circuit shorted to battery)
36: DRL enable circuit (circuit shorted to battery)
37: DRL enable circuit (circuit open or shorted to ground)
38: EEPROM calibration error
39: EEPROM calibration id error
40: Delay pot circuit (circuit shorted to ground)
41: Dealy pot circuit (circuit open or shorted to battery)
42: Key resistor circuit (circuit shorted to ground)
43: Key resistor circuit (circuit open or shorted to battery)
44: Steering wheel sensor circuit (circuit open or shorted to ground)
45: Steering wheel sensor circuit (circuit open or shorted to battery)
46: CCM internal failure
47: Canadian select input error

HVAC Diagnostic trouble codes (-02)

01: Outside air tempurature sensor circuit (circuit open)
02: Outside air tempurature sensor circuit (circuit shorted)
03: In car air tempurature sensor circuit (circuit open)
04: In car air tempurature sensor circuit (circuit shorted)
05: Sun load sensor circuit (circuit open)
06: Sun load sensor circuit (circuit shorted)
10: Air mix motor circuit (circuit open)
11: Air mix motor circuit (circuit shorted)
26: Serial Data Communication (circuit shorted to battery, shorted to ground, or circuit open)
27: Invalid EEPROM detected

SIR Diagnostic trouble codes (-03)

15: Passenger deployment loop resistance high
16: Passenger deployment loop resistance low
17: Passenger deployment loop open
21: Driver deployment loop resistance high
22: Driver deployment loop resistance low
24: Deployment loop voltage low
25: Deployment loop shorted to ignition
26: Driver's deployment loop open
35: ADS (auxiliary discriminating sensor) missing/shorted to ground
36: ADS closed/shorted to voltage
51: Frontal crash detected
52: Crash data area full
61: Lamp circuit failure
62: Redundant lamp circuit failure
71: Internal SDM malfuntion

ABS/TC Diagnostic trouble codes (-04)

21: RF wheel speed sensor circuit malfunction
23: RF wheel speed sensor circuit continuity malfunction
25: LF wheel speed sensor circuit malfunction
27: LF wheel speed sensor circuit continuity malfunction
28: Wheel speed sensor circuit frequency malfunction
31: RR wheel speed sensor circuit malfunction
33: RR wheel speed sensor circuit continuity malfunction
35: LR wheel speed sensor circuit malfunction
37: LR wheel speed sensor circuit continuity malfunction
41: Right front valve soleniod malfunction
42: RH outlet valve solenoid malfunction
45: Left front valve solenoid malfunction
46: LF outlet valve solenoid malfunction
47: ASV prime line solenoid malfunction
48: USV pilot valve solenoid malfunction
51: Right rear valve solenoid malfunction
52: RR outlet valve solenoid malfunction
55: Left rear valve solenoid malfunction
56: LR outlet valve solenoid malfunction
57: TCC disable relay output malfunction
58: EBTCM internal adjuster assembly malfunction
61: Pump motor or pump motor relay malfunction
62: Traction disable switch used or RPM signal malfunction
63: valve solenoid relay malfunction
64: Throttle position signal malfunction
65: Adjuster assembly circuit malfunction
66: Adjuster assembly control malfunction
67: Throttle position sensor comparison malfunction
71: EBTCM internal malfunction
72: Serial data link malfunction
73: Spark retard monitoring malfunction
85: Low voltage.

[Goldmaster]

Can anyone confirm that you can pull diagnostic codes from the HVAC on a 96 RMS? I know it works on 94/95 cars, but I just picked up my first 96 and it's got some issues.
http://www.impalassforum.com/vBullet...d.php?t=253993

It has a check engine light on, but I haven't been able to get a code to display on the HVAC... I don't trust driving it to the parts store yet to use their scanner...

[94MI9C1]

This is all that I have Goldy from Alldata, it may help but not sure.

Diagnostic Trouble Codes can be accessed thru the H-AC Control Panel.

CURRENT AND HISTORY DIAGNOSTIC TROUBLE CODES
If the ACAC system detects an error within the HVAC system, a current and history diagnostic trouble code (DTC) will be set. Once the failure is no longer detected, the DTC will be stored only as history trouble code. A two-digit code is a current DTC and the same two-digit code preceded by a "1" is a history DTC. History codes will be stored for 199 ignition cycles. When the counter gets to 199, all history trouble codes will be cleared and the counter will be set back to zero. There will not be any indication to the operator that a failure has been detected or that a current or history trouble code is stored in the H-A/C control memory unless the self-diagnostic mode is entered. If an HVAC DTC is set, the H-A/C control will use a "default value" until the DTC has been cleared or repaired.

TO ENTER THE "ACAC DIAGNOSTIC SYSTEM CHECK"
To enter the "ACAC Diagnostic System Check," press the "TEMP" up switch and the "OFF" switch on the control panel at the same time. Upon entry, a segment check will be performed and then the graphic display will show pointer number "-00". If the compressor clutch is being requested, the "EXT TEMP" graphics will be displayed. The fan up and fan down switch can be used to increase and decrease the pointer number. The "MIDDLE" switch can be used to change from pointer number -02 to DTC or parameter values for pointers "05-31."

TO DISPLAY HVAC DTCs
To display HVAC DTCs. select pointer number "-02". and press the "MIDDLE" switch. At this time any current and history trouble codes will be displayed. A failure indicates that the control has detected an open, short to ground or faulty component in that circuit. While that failure is detected, the control will use a default value. When the graphic display is displaying numbers 200 to 299, they appear as numbers 100 through 199 with a "-" in front of them. For example. the value of 200 would be displayed as "-100."

CLEARING DIAGNOSTIC TROUBLE CODES
HVAC DTCs can he cleared from H-A/C control by pressing the "OFF" button while in diagnostic pointer number "-02" while the HVAC DTCs are displaying.

To exit the self-diagnostic mode, press the AUTO" switch.

[Goldmaster]

Thanks Mike, but that doesn't help any. You get an A for effort though The first selection in diagnostic mode (-00)is supposed to be for PCM codes. But when I hit the "middle" button, all I get is - - So I don't know that the HVAC system will pull OBD 2 codes or not.

I'm pretty sure I know why the CEL is on, but would like to see what all is stored. Guess I'll have to borrow a scanner from a guy at work. It also flashes from time to time while the engine is running, so I assume that is PO300 random multiple misfire (which it definitely has lol) Has 170K and the wires look original, I wouldn't doubt if the plugs are too. But opti and waterpump have been replace before with what looks like el cheapo stuff. So I'm gonna do plugs, wires, opti, wp, seals and fix the heater core and see what happens... Still gotta go through and check the fuel pressure and stuff first, but I'm pretty confident it's in the ignition system.