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