Was the Horns Diagnostic System Check performed?

--

Go to Step 2

Refer to Horns System Check .

Remove the horn relay K63 from the relay box.

Do the horns still sound?

--

Go to Step 3

Go to Step 4

1. Locate a short to ground in the following circuits:

•

XM30

•

XM60

•

XM65

•

XM70

2. Repair the short to ground in any one of these circuits.

Is the repair complete?

--

Go to Step 9

--

Using a DMM, measure the resistance from terminal 6 of the horn relay K63 and a known good ground.

Is the measured resistance within the specified value?

Value less than 5ohms

Go to Step 5

Go to Step 7

1. Disconnect the horn switch.
2. Use a DMM in order to measure the resistance from terminal 6 of the horn relay K63 and a known good ground.

Is the measured resistance within the specified value?

Less than 5ohms

Go to Step  6

Go to Step 8

1. Locate a short to ground in CKT XM1 and/or CKT XM899.
2. Replace the BCM if CKT XM899 and/or CKT XM1 is OK.

Refer to Body Control Module.

Is the repair complete?

--

Go to Step 9

--

Replace the horn relay K63.

Is the replacement complete?

--

Go to Step 9

Go to Step 5

1. Replace the horn switch.
2. Refer to Horn Switch Replacement - On Vehicle in Steering Wheel and Column On-Vehicle Service.

Is the replacement complete?

--

Go to Step 9

--

1. Connect all the connectors and components that were disconnected.
2. Verify that both horns operate properly.

Do both of the horns operate properly?

--

System OK

Go to Step 1