Horns Always On. Opel Sintra 1999

For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---

Important: Use the J 35616 whenever a diagnostic procedure requires you to test or probe a terminal. Use the J 35616 for the following reasons:

• | In order to prevent damage to the terminal

• | In order to indicate whether the contact tension is sufficient

If the contact tension seems incorrect, refer to Checking Terminal Contact in Troubleshooting Procedures.

1 | Inspect the vehicle for UA6 theft deterrent option. Is the vehicle equipped with UA6 system? | -- | Go to Step 2 | Go to Step 3
2 | Test the vehicle for body control module DTCs. Refer to Diagnostic System Check - Body Control System in Body Control Systems. Are DTCs present? | -- | Go to the appropriate DTC table in Body Control Systems | Go to Step 3

3

1. Disconnect the horn relay.
2. Connect a test lamp between horn relay terminal 85 CKT 28 and terminal 86 CKT 740.

Does the test lamp light?

--

Go to Step 4

Go to Step 6

4

1. Disconnect the body control module (BCM) connector C2.
2. Connect a test lamp in the same location.

Does the test lamp light?

--

Go to Step 5

Go to Step 7

5

1. Inspect for a short to ground in CKT 28 between the horn switch(es) and the underhood accessory wiring junction block.
2. Inspect for a short to ground in CKT 28 between the BCM and the underhood accessory wiring junction block.

Is the repair complete?

--

System OK

--

6

1. Test for a short to B+ in CKT 29.
2. If CKT 29 is OK, replace the horn relay in Underhood Accessory Wiring Junction Block.

Is the repair complete?

--

System OK

--

7 | Replace the BCM. Refer to Body Control Module Replacement . Is the repair complete? | -- | System OK | --