DTC B1020
Diagnostic Instructions
DTC Descriptor
| DTC B1020 00: Auxiliary Electronic Control
Unit (ECU) Performance |
Circuit/System Description
The radio communicates with the radio controls via serial data.
This DTC indicates a fault in the radio controls. No external
circuits are involved. The radio may continue to respond normally
to faceplate functions when this DTC is set.
Conditions for Running the DTC
| • |
Ignition is ON or in the ACC
position. |
| • |
The system voltage is at least
9.5 V and no more than 15.5 V. |
| • |
All the above conditions are
present for greater than 10 seconds. |
Conditions for Setting the DTC
The radio receives an improper status response indicating an
internal ECU fault in the radio controls.
Action Taken when the DTC Sets
No action is taken.
Conditions for Clearing the DTC
| • |
A current DTC clears when the
radio receives a proper status response message back from the radio
control assembly. |
| • |
A history DTC clears after 50
malfunction-free ignition cycles. |
Diagnostic Aids
| • |
This DTC may be stored as a
history DTC without affecting the operation of the radio
controls. |
| • |
If stored only as a history
DTC and not retrieved as a current DTC, do not replace the radio
controls. |
| • |
If this DTC is retrieved as
both a current and history DTC, replace the radio controls.
|
Reference Information
Schematic Reference
Radio/Navigation System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Radio/Audio System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
| 2. |
Verify DTC B1020 is not
set. |
⇒ If DTC B1020 is
set
Replace the A22 radio controls.
⇓ If DTC B1020 is
not set
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the repair.
Control Module References for radio controls replacement,
programming, and setup
|
