GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Opel 🢒 1999 🢒 Sintra 🢒 Body and Accessories 🢒 Data Link Communications 🢒 Scan Tool Does Not Communicate with E and C Data Line

Step

Action

Value(s)

Yes

No

1

Was the entire Data Link Connector (DLC) system check performed?

--

Go to Step 2

Go to Data Link Communications System Check

2

Use a J 39200 , DMM in order to measure the voltage between B+ and DLC terminal 5.

Is the voltage within the specified range?

B+ (9-14 V)

Go to Step 3

Go to Step 4

3

Inspect for proper connection of the scan tool to the DLC.

Is the connection OK between the scan tool and the DLC?

--

Go to Step 5

Go to Step 6

4

Repair the poor connection or an open in circuit 1550 between the DLC and ground.

Is the repair complete?

--

Go to Step 18

--

5

Attempt to establish communication with the radio on a different vehicle using the scan tool.

Can communication be established with the scan tool?

--

Go to Step 7

Go to Step 8

6

Repair the poor connection between the DLC terminal 14 and the scan tool.

Is the repair complete?

--

Go to Step 18

--

7
  1. Reconnect the scan tool to the DLC.
  2. Turn the ignition switch to the RUN position.
  3. Use a scan tool in order to re-attempt to establish communication with the radio.

Can the scan tool communicate with the radio?

--

Go to Step 9

Go to Step 10

8

The scan tool may be malfunctioning. Refer to the scan tool instruction manual for additional information.

Is the action complete?

--

Go to Step 18

--

9
  1. The malfunction is not present or intermittent.
  2. Inspect CKT 835 and the radio for a poor connection or open, a short to B+ or a short to ground. Repair as needed.

Is the repair complete?

--

Go to Step 18

--

10
  1. Turn the ignition switch OFF.
  2. Disconnect the radio connector C2.
  3. Use a J 39200 , DMM in order to measure the resistance between the DLC terminal 5 and terminal 14.

Is the resistance the same as the specified value?

Infinite

Go to Step 11

Go to Step 12

11
  1. Turn the ignition switch to the RUN position.
  2. Use a J 39200 , DMM in order to measure the voltage between the DLC terminal 5 and terminal 14.

Is the voltage within the specified value?

Less than 1 V

Go to Step 13

Go to Step 14

12

Repair the short to ground in circuit 835.

Is the repair complete?

--

Go to Step 18

--

13

Use a J 39200 , DMM in order to measure the resistance between the DLC terminal 14 and the radio harness connector C2 terminal 15.

Is the resistance within the specified value?

0-2ohms

Go to Step 15

Go to Step 16

14
  1. Turn the ignition switch OFF.
  2. Repair the short to B+ in circuit 835.

Is the repair complete?

--

Go to Step 18

--

15
  1. Turn the ignition OFF.
  2. Reconnect the radio.
  3. Turn the ignition switch to the RUN position.
  4. Use a scan tool in order to attempt to establish communication with the radio.

Can the scan tool communicate with the radio?

--

Go to Step 18

Go to Step 17

16

Repair the poor connection or an open in circuit 835.

Is the repair complete?

--

Go to Step 18

--

17

Inspect for power, ground and proper connections to the radio. Refer to Diagnostic System Check - Radio/Audio System in Entertainment for additional information.

Is the action complete?

--

Go to Step 18

--

18
  1. Ensure that the ignition switch is OFF.
  2. Reconnect the connectors. Reinstall the components.

Is the action complete?

--

Go to Data Link Communications System Check

--