DTC Inspection

Make

Aston Martin

Model

DB9 Factory Workshop Manual

Year

Issue 2, 2005

Section

Air Conditioning (A/C) System › DTC Inspection

12 Climate controlDTC Inspection · page 1 of 2

A/C Module (C0791)
Pin	Specification
1	Air flow mode actuator (output)
2	Temperature actuator (output)
3	Blank
4	Blank
5	Blank
6	A/C On (A/C pressure sensor)
7	Blank
8	Recirculation actuator (output)
9	Blank
10	Blank
11	Temperature level (RHD)
12	Blower speed regulator (Output)
13	Air flow mode actuator (output)
14	Temperature actuator (output)
15	Blank
16	Output
17	HAVAC ECU (input)
18	Blank
19	Blower relay (engine bay fusebox)
20	Recirculation actuator (output)
21	Blank
22	blank
23	Temperature level (LHD)
24	Blower speed regulator input)

DTC Inspection

Using WDS

1. Connect the WDS to the body diagnostic socket (Refer to ‘Appendix & Glossary’, page 20-1-2).
2. Select ‘Air-Con’ from the menu.
3. Read the fault codes from the WDS screen.

DTC Fault Codes

DTC	Fault Code Definition
10	Switchpack 1 disconnected.
20	Switchpack 2 disconnected.
30	Analogue digital converter 100us timeout.
40	Serial transmit 10ms timeout.
111	Temperature control - short circuit to ground on A.
122	Temperature control - short circuit to 5 volts on A.
133	Temperature control - short circuit to ground on B.
144	Temperature control - short circuit to 5 volts on B.
250	Temperature – bad pair.
260	Mode control - short circuit to ground.
270	Mode control - short circuit to 5 volts.
280	Fan control - short circuit to ground.
355	Fan control – short circuit to 5 volts.
366	Bad response data - temperature.
377	Bad response data - mode.

13 Heating & A/C