Description And Operation; Data Link Connector Circuit Description - GMC Chevrolet Camaro 1998 Service Manual

8-382 Wiring Systems Body and Accessories
Scan Tool Does Not Communicate w/Class 2 Data Line (cont'd)
Step Action
1. Turn the ignition switch to the OFF position.
15
2. Repair the short to voltage in CKT 1807.
Is the repair complete?
16
Repair the poor connection or an open in CKT 1807.
Is the repair complete?
1. Ensure that the ignition switch is in the OFF position.
17
2. Reinstall connectors/components removed.
Is the action complete?
Description and Operation
Data Link Connector Circuit Description
The data link connector (DLC) contains the following
components:
• The UART serial data line (CKT 800)
- The UART serial data line (CKT 800) allows
the following components to communicate
data with each other:
• The Powertrain Control Module (PCM)
• The inflatable restraint diagnostic energy
reserve module with sensor(SDM)
• The Electronic Brake Control
Module (EBCM)
- The UART serial data line allows a scan tool
to communicate with these modules for
diagnosis and testing.
• The class 2 serial data line (CKT
1807)
The class 2 serial data line allows a scan tool to
communicate with the PCM for diagnosis and
testing.
• Unswitched voltage (B+) (CKT 540)
• Ground (CKT 650)
Value(s)
Yes
No
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Go to Step 17
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Go to Step 17
Go to Data Link
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Communications
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System Check
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