#
ON-BOARD DIAGNOSTIC SYSTEM CONSTRUCTION

BHE070261190T02

## Block Diagram

1 | A/C amplifier
2 | On-board diagnostic function
3 | A/C operation check mode
4 | Malfunction display function
5 | Present malfunction display mode
6 | Past malfunction display mode
7 | Memory function
8 | Fail-safe function
9 | Malfunction detection function
10 | Regular control
11 | Input part
12 | Output part
13 | NG
14 | OK

## Condition Transition Diagram

1 | Regular control
2 | On-board diagnostic function
3 | A/C operation check mode
4 | Present malfunction display mode
5 | DTC display
6 | Past malfunction display mode
7 | DTC display
8 | Past malfunction memory clear
9 | A/C switch ON
10 | AUTO and REC/FRESH switches on simultaneously
11 | AUTO switch on
12 | Climate control unit display completely illuminated (for 4 s)
13 | Step 1
14 | Step 2
15 | Step 3
16 | Step 4
17 | REC/FRESH switching switch on