P1530

DTC P1530: A/C1 Switch Circuit Intermittent

TECHNICAL DESCRIPTION
- The A/C-ECU sends the "ON" signal of the A/C to the ECM.
- The ECM receives the "ON" signal sent by the A/C-ECU, and turns the A/C relay to "ON" position.

DTC SET CONDITIONS

Check Condition
- Engine is running.

Judgment Criterion
- The A/C switch repeats on-off switches 255 times per second.

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- A/C-ECU failed.

DIAGNOSIS

Required Special Tools:
- MB991958: Scan tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991911: Main Harness B

STEP 1. Using scan tool MB991958, read the diagnostic trouble code (DTC)

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK"(OFF) position before connecting or disconnecting scan tool MB991958.




1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. After the DTC has been deleted, read the DTC again.
4. Turn the ignition switch to the "LOCK"(OFF) position.

Q: Is DTC P1530 set?

YES: Replace the A/C-ECU.

NO: It can be assumed that this malfunction is intermittent.