Step
| Action
| Value(s)
| Yes
| No
|
1
| Check the horn fuse (Fuse 24) for an open.
Is the horn fuse open?
| --
|
Go to Step 2
|
Go to Step
3
|
2
|
- Remove the horn relay (Relay 15).
- With a test lamp frontprobe the underhood accessory wiring junction
block between terminals 740 and BATT, where the fuse was.
Does the test light illuminate?
| --
|
Go to Step 4
|
Go to Step
5
|
3
|
- Disconnect the horn assembly connector.
- With a test light, probe between circuit 29 and circuit 1350 at
horn assembly connector.
- Press the horn switch while observing the test light.
Does the test light illuminate?
| --
|
Go to Step 8
|
Go to Step
9
|
4
| Replace the underhood accessory
wiring junction block. Refer to
Accessory Wiring Junction Block Replacement
,
in Body Front End.
Has the repair been made?
| --
| Go to
Horns System Check
| --
|
5
|
- Leave the test light in the same location.
- Re-install the horn relay.
Does the test light illuminate?
| --
|
Go to Step 12
|
Go to Step
6
|
6
|
- Leave the test light in the same location.
- Disconnect the horn assembly connector.
- Press the horn switch.
Does the test light illuminate?
| --
|
Go to Step 7
|
Go to Step
8
|
7
| Repair a short to ground in circuit 29,
between the underhood accessory wiring junction block connector C3 terminal
C8 and the horn assembly terminal B.
Has the repair been made and the system rechecked?
| --
| Go to
Horns System Check
| --
|
8
| Replace the horn assembly.
Has the repair been made?
| --
| Go to
Horns System Check
| --
|
9
|
- Remove the horn relay (Relay 15).
- With a test light, frontprobe between each 740 circuit
and ground.
Does the test light illuminate for both 740 circuits?
| --
|
Go to Step 10
|
Go to Step 4
|
10
|
- With a test light, probe between circuit 29 and circuit 350 at
the horn assembly connector.
- Momentarily connect a 5A fused jumper between the horn relay terminals
between circuit 29 and circuit 740, of the Accessory Wiring
Junction Block while observing the test light.
Does the test light illuminate?
| --
|
Go to Step 11
|
Go to Step
19
|
11
|
- With a test light front probe between circuits 28 and circuit
740 (on the underhood accessory wiring junction block).
- Press the horn switch while observing the test light.
Does the test light illuminate?
| --
|
Go to Step 12
|
Go to Step
13
|
12
| Replace the horn relay. Refer to
Horn Relay Replacement
, in Body Front End.
Has the repair been made?
| --
| Go to
Horns System Check
| --
|
13
|
- Leave the test light in the same location
- Disable the Supplemental Inflatable Restraint (SIR) System. Refer
to
Disabling the SIR System
, in SIR.
- Remove the horn switch wires from the steering wheel.
- Leave the test light connected between circuits 28 and 740 (from
previous step).
- Momentarily connect a 5A fused jumper from ground to the spring
loaded terminal leading towards C201 (at base of steering column).
Did the test light illuminate?
| --
|
Go to Step 14
|
Go to Step
16
|
14
| Check for poor connection of horn
switch ground to steering.
Is there a poor connection?
| --
|
Go to Step 23
|
Go to Step
15
|
15
| Replace the horn switch. Refer
to
Inflatable Restraint Steering Wheel Module Replacement
, in SIR.
Has the repair been made?
| --
| Go to
Horns System Check
| --
|
16
|
- Disconnect the underhood accessory wiring junction block connector
C2.
- With a test light frontprobe between circuits 28 and 740 (on the
underhood accessory wiring junction block).
- Momentarily connect a 5A fused jumper between the underhood accessory
wiring junction block where connector C2 terminal F7 was and ground.
Did the test light illuminate?
| --
|
Go to Step 17
|
Go to Step
4
|
17
|
- Reconnect the horn assembly connector.
- Re-install the horn relay.
- Momentarily connect a 5A fused jumper between the underhood accessory
wiring junction block where connector C2 terminal F7 was and ground.
Did the horn sound?
| --
|
Go to Step 18
|
Go to Step
12
|
18
| Repair an open in circuit 28.
Has the repair been made?
| --
| Go to
Horns System Check
| --
|
19
|
- Disconnect the underhood accessory wiring junction block connector
C3.
- With a test light frontprobe between circuits 29 and 740 (on the
underhood accessory wiring junction block.
- Momentarily connect a 5A fused jumper between the underhood accessory
wiring junction block where connector C3 terminal C8 was and ground.
Did the test light illuminate?
| --
|
Go to Step 20
|
Go to Step
4
|
20
| With a test light, probe between
the horn assembly connector terminal A and B+.
Does the light illuminate?
| --
|
Go to Step 21
|
Go to Step
22
|
21
| Repair an open in circuit 1350.
Has the repair been made?
| --
| Go to
Horns System Check
| --
|
22
| Repair an open in circuit 29.
Has the repair been made?
| --
| Go to
Horns System Check
| --
|
23
| Repair a poor connection from the horn switch ground circuit to the
steering wheel.
Has the repair been made?
| --
| Go to
Horns System Check
| --
|
