DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK HARNESS AND CONNECTOR
CHECK AIR CONDITIONING AMPLIFIER
CHECK AIR CONDITIONING AMPLIFIER
DTC B1497/97 BUS IC Communication Malfunction
DESCRIPTION
The air conditioning harness connects the air conditioning amplifier and each servo. The air conditioning amplifier supplies power and sends operation instructions to each servo through the air conditioning harness. Each servo sends the damper position information to the air conditioning amplifier.
| DTC No. | DTC Detection Condition | Trouble Area |
| B1497/97 |
Communication line error or open |
Air conditioning harness
A/C amplifier
|
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.CHECK HARNESS AND CONNECTOR |
Remove the A/C amplifier.
Disconnect the connector from the A/C amplifier.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Condition |
| J58-20 (GND) - Body ground | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 2.CHECK AIR CONDITIONING AMPLIFIER |
Reconnect the connector to the A/C amplifier.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Condition |
| e1-2 (BUS G) - Body ground | Always | Below 1 Ω |
| | REPLACE AIR CONDITIONING AMPLIFIER |
|
|
| 3.CHECK AIR CONDITIONING AMPLIFIER |
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
| Tester Connection | Condition | Specified Condition |
| e1-4 (B BUS) - e1-2 (BUS G) | Engine switch off | Below 1 V |
| e1-4 (B BUS) - e1-2 (BUS G) | Engine switch on (IG) | 10 to 14 V |
| | REPLACE AIR CONDITIONING AMPLIFIER |
|
|
| OK | |
| |
| REPLACE AIR CONDITIONING HARNESS |
|
LEXUS IS250, IS220d / GSE20 ALE20
