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Cadillac Brougham BCM and PCM Codes and Diagnostic Procedures

Diagnostics Basic Operation

Step	Action
1	Enter self diagnostics by simultaneously pressing and holding the "OFF" and "WARMER" buttons on the Electronic Climate Control panel until the automatic segment check begins.
2	Malfunction codes are displayed in the following order: ..- ECC current codes ( parameter number -00 ) 1..- ECC history codes ( parameter number -00 )
3	To select a specific parameter, press "HI" to increment and "LO" to decrement the parameter number.
4	After the status light display begins, ECC error codes are displayed.  PCM codes may be displayed by selection parameter -01 and then pressing the "OUTSIDE TEMP" button.
5	Exit diagnostics by pressing the "AUTO" button
6	Pressing "OUTSIDE TEMP" switches between parameter number and parameter data
7	To over-ride a program number, while in program number display, parameter -11, pressing "WARMER" or "COLDER" will increase or decrease the program number.

 

Parameter Number -00

ECC Diagnostic Codes

Code	Malfunction
00	No ECC system fault
10	Out-side ambient temp sensor malfunction
12	A/C evaporator inlet temp sensor malfunction
13	In-car tem sensor malfunction
19	Blower motor failure
32	PCM-ECC data problem
40	Air mix valve problem
48	Very low refrigerant pressure level
49	High engine temp
50	EVO system fault

 

Parameter Number -01

PCM Diagnostic Codes

Code	Malfunction
00	No PCM faults
12	No engine RPM References pulses
13	Oxygen sensor circuit fault
14	Shorted coolant sensor circuit fault
15	Open coolant sensor circuit fault
21	Open throttle position sensor circuit fault
22	Shorted throttle position sensor circuit fault
23	Open MAT sensor circuit fault
24	VSS circuit fault
25	Shorted MAT sensor circuit fault
32	EGR system fault
33	Open MAP sensor circuit fault
34	Shorted MAP sensor circuit fault
42	EST/bypass circuit fault
43	ESC failure
44	Lean O2 signal
45	Rich O2 signal
51	PROM error
52	Backup fuel cal-pack missing
54	Fuel pump relay malfunction
55	A/D Converter malfunction

 

Parameters

Number	Description	Range	Units
-00	ECC fault codes	00-150	Code
-01	PCM fault codes	00-55	Code
-02	Program number	0-255	Counts
-03	IAC motor position	0-255	Counts
-04	MAP	0-255	KPA
-06	TPS	0-255	Counts
-07	Oxygen sensor		Volts
-08	MAT		C
-10	Ignition voltage	9.0-16.0	Volts
-11	Program number	0-100	%
-12	Vehicle speed	0-199	MPH
-19	Actual blower voltage	-3.3-18	Volts
-20	Commanded blower voltage	-3.3-18	Volts
-21	Engine coolant temp	-40-151	C
-22	Commanded blend door position	0-255	Counts
-23	Actual blend door position	0-255	Counts
-24	Air delivery mode	0-6	Code
-25	In-car temp	-40-102	C
-26	Outside air temp	-40-93	C
-28	Evaporator inlet temp	-40-93	C
-30	Ignition cycle counter	0-99	Counts
-31	PROM ID	0-9999	Code

 

Air Delivery Mode

Code	Mode
0	Max A/C
1	A/C
2	Intermediate
3	Heater
4	Defrost
5	Blower delay
6	Off

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