Service Manual2007 Captiva HORNS

SECTION 9C

HORNS

Caution : Disconnect the negative battery cable before removing or installing any electrical unit or when a tool or equipment could easily come in contact with exposed electrical terminals. Disconnecting this cable will help prevent personal injury and damage to the vehicle. The ignition must also be in LOCK unless otherwise noted.

SPECIFICATIONS

Fastener Tightening Specifications

Application	N•m	Lb-Ft	Lb-In
Horn Bolt	20	15	-

SCHEMATIC AND ROUTING DIAGRAMS

Horn Wiring System

DIAGNOSIS

Symptoms - Horns

Test Description

The numbers below refer to the step numbers on the diagnostic table.

Verfies that the body control module (BCM) is providing ground to the horn relay.
Tests for voltage at the battery positive voltage terminal of the horn relay coil.
Tests for voltage at the battery positive voltage terminal of the horn relay switch. The HORN fuse supplies power to the battery positive voltage terminal of the horn relay switch.
The horns need maximum current flow to operate properly. A high resistance, greater than 0.5 ohms, in the horn control circuit or the horn ground circuit could cause operating problems with the horns. Inspect the circuits for faults that would restrict current flow.
The horn relay control circuit includes the horn slip ring and the horn switch. The horn slip ring and the horn switch must be tested for a high resistance, an open or a short to voltage when testing the relay control circuit.

Symptoms - Horns

Step	Action	Value(s)	Yes	No
1	Check fuse F17. Did you perform the Diagnostic System Check–Vehicle?	-	Go to Step 2	Check the vehicle with the scan tool.
2	Is the vehicle equipped with keyless entry ? Is the repair complete?	-	Go to Step 3	Go to Step 4
3	Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, command the Body Control Module Horn Output ON and OFF. Is the voltage equal to the specified value?	-	Go to Step 4	Go to Step 5
4	Depress the horn switch. Does the horn operate?	-	Go to Section 9A, Body Wiring Systems Testing for Intermittent and Poor Connections.	Go to Step 6
5	Test the body control module (BCM) portion of the horn relay control circuit for a high resistance or an open. Did you find and correct the condition?	-	Go to Step 25	Go to Step 14
6	Turn OFF the ignition. Disconnect the horn relay. Connect a test lamp between the battery positive voltage circuit of the horn relay coil and a good ground. Does the test lamp illuminate?	-	Go to Step 7	Go to Step 17
7	Connect a test lamp between the battery positive voltage circuit of the horn relay coil and the horn relay control circuit. Depress and hold the horn switch. Does the test lamp illuminate?	-	Go to Step 8	Go to Step 18
8	Connect a test lamp between the battery positive voltage circuit of the horn relay switch and a good ground. Does the test lamp illuminate?	-	Go to Step 9	Go to Step 19
9	Momentarily connect a 15-amp fused jumper wire between the battery positive voltage circuit of the horn relay switch and the horn control circuit. Does the horn operate?	-	Go to Step 15	Go to Step 10
10	Reconnect the horn relay. Disconnect the horn connector. Connect a test lamp between the horn control circuit and a good ground. Depress and hold the horn switch. Does the test lamp illuminate?	-	Go to Step 11	Go to Step 20
11	Connect a test lamp between the horn control circuit and the horn ground circuit. Depress and hold the horn switch. Does the test lamp illuminate?	-	Go to Step 12	Go to Step 21
12	Inspect for poor connections at the horn. Did you find and correct the condition?	-	Go to Step 25	Go to Step 13
13	Connect a 15-amp fused jumper wire between the positive battery terminal and the control terminal of the horn. Connect another jumper wire between the negative battery terminal and the ground terminal of the horn. Does the horn operate?	-	Go to Step 16	Go to Step 24
14	Inspect for poor connections at the harness connector of the BCM. Did you find and correct the condition?	-	Go to Step 25	Go to Step 22
15	Inspect for poor connections at the horn relay. Did you find and correct the condition?	-	Go to Step 25	Go to Step 23
16	Repair the high resistance in the horn control circuit or the horn ground circuit. A resistance as low as 0.5 ohms could cause operating problems with the horns. Did you complete the repair?	-	Go to Step 25	-
17	Repair the open or high resistance in the battery positive voltage circuit of the horn relay coil. Did you complete the repair?	-	Go to Step 25	-
18	Important : The horn switch is part of the inﬂatable restraint steering wheel module. Refer to section 8B, Supplemental Inflatable Restraints (SIR). Repair the open or short to voltage in the horn relay control circuit. The horn relay control circuit includes the horn slip ring and the horn switch. Did you complete the repair?	-	Go to Step 25	-
19	Repair the open or high resistance in the battery positive voltage circuit of the horn relay switch. Did you complete the repair?	-	Go to Step 25	-
20	Repair the open or high resistance in the horn control circuit. Did you complete the repair?	-	Go to Step 25	-
21	Repair the open or high resistance in the horn ground circuit. Did you complete the repair?	-	Go to Step 25	-
22	Important : Perform the BCM programming procedure when replacing the BCM. Replace the BCM. Refer to Section 9V, Body Control Module. Did you complete the repair?	-	Go to Step 25	-
23	Replace the horn relay. Did you complete the replacement?	-	Go to Step 25	-
24	Replace the horn. Did you complete the replacement?	-	Go to Step 25	-
25	Operate the horn. Does the horn operate properly?	-	System OK	Go to Step 25

Horn Always On

Test Description

The numbers below refer to the step numbers on the diagnostic table.

Tests if ground is constantly being applied to the horn relay.
The horn relay control circuit includes the horn slip ring and the horn switch. The horn slip ring and the horn switch must be tested for a short to ground when testing the relay control circuit.

Horns Always On

Step	Action	Value(s)	Yes	No
1	Did you perform the Diagnostic System Check–Vehicle?	-	Go to Step 2	Check the vehicle with the scan tool.
2	Is the vehicle equipped with keyless entry?	-	Go to Step 3	Go to Step 4
3	Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, command the Body Control Module Horn Output ON and OFF. Is the horn on at all times?	-	Go to Step 4	Go to Section 9A, Body Wiring Systems Testing for Intermittent and Poor Connections.
4	Turn OFF the ignition. Disconnect the horn relay. Does the horn operate?	-	Go to Step 9	Go to Step 5
5	Connect a test lamp between the battery positive voltage circuit of the horn relay coil and the horn relay control circuit. Does the test lamp illuminate?	-	Go to Step 6	Go to Step 7
6	Important : The horn switch is part of the inﬂatable restraint steering wheel module. Refer to Refer to Section 8B, Supplemental Inflatable Restraints (SIR). Test the horn relay control circuit for a short to ground. Did you find and correct the condition?	-	Go to Step 12	Go to Step 8
7	Inspect for poor connections at the horn relay. Did you find and correct the condition?	-	Go to Step 12	Go to Step 10
8	Inspect for poor connections at the body control module (BCM). Did you find and correct the condition?	-	Go to Step 12	Go to Step 11
9	Repair the short to voltage in the horn control circuit. Did you complete the repair?	-	Go to Step 12	-
10	Replace the horn relay. Did you complete the replacement?	-	Go to Step 12	-
11	Important : Perform the BCM programming procedure when replacing the BCM. Replace the BCM. Refer to Section 9V, Body Control Module. Does the test lamp illuminate?	-	Go to Step 12	-
12	Operate the horn. Does the horn operate properly?	-	System OK	Go to Step 1

Horn Inoperative

Test Description

The numbers below refer to the step numbers on the diagnostic table.

Verifies that the body control module (BCM) is providing ground to the horn relay.
Tests for voltage at the battery positive voltage terminal of the horn relay coil.
Tests for voltage at the battery positive voltage terminal of the horn relay switch. The HORN fuse supplies power to the battery positive voltage terminal of the horn relay switch.
The horns need maximum current flow to operate resistance, an open or a short to voltage when properly. A high resistance, greater than testing the relay control circuit. Inspect the circuits for faults that would restrict current flow.
The horn relay control circuit includes the horn slip ring and the horn switch. The horn slip ring and the horn switch must be tested for a high resistance, an open or a short to voltage when testing the relay control circuit.

Horns Inoperative

Step	Action	Value(s)	Yes	No
1	Check the vehicle with the scan tool.	-	Go to Step 2	Check the vehicle with the scan tool.
2	Is the vehicle equipped with keyless entry?	-	Go to Step 3	Go to Step 4
3	Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, command the Body Control Module Horn Output ON and OFF. Does the horn operate?	-	Go to Step 4	Go to Step 5
4	Depress the horn switch. Does the horn operate?	-	Testing for Intermittent	Go to Step 6
5	Test the body control module (BCM) portion of the horn relay control circuit for a high resistance or an open. Did you find and correct the condition?	-	Go to Step 25	Go to Step 14
6	Turn OFF the ignition. Disconnect the horn relay. Connect a test lamp between the battery positive voltage circuit of the horn relay coil and a good ground. Does the test lamp illuminate?	-	Go to Step 7	Go to Step 17
7	Connect a test lamp between the battery positive voltage circuit of the horn relay coil and the horn relay control circuit. Depress and hold the horn switch. Does the test lamp illuminate?	-	Go to Step 8	Go to Step 18
8	Connect a test lamp between the battery positive voltage circuit of the horn relay switch and a good ground. Does the test lamp illuminate?	-	Go to Step 9	Go to Step 19
9	Momentarily connect a 15-amp fused jumper wire between the battery positive voltage circuit of the horn relay switch and the horn control circuit. Does the horn operate?	-	Go to Step 15	Go to Step 10
10	Reconnect the horn relay. Disconnect the horn connector. Connect a test lamp between the horn control circuit and a good ground. Depress and hold the horn switch. Does the test lamp illuminate?	-	Go to Step 11	Go to Step 20
11	Connect a 15-amp fused jumper wire between the positive battery terminal and the control terminal of the horn. Connect another jumper wire between the negative battery terminal and the ground terminal of the horn. Does the test lamp illuminate?	-	Go to Step 12	Go to Step 21
12	Inspect for poor connections at the horn. Did you find and correct the condition?	-	Go to Step 25	Go to Step 13
13	Connect a test lamp between the horn control circuit and the horn ground circuit. Depress and hold the horn switch. Does the horn operate?	-	Go to Step 16	Go to Step 24
14	for poor connections at the harness connector of the BCM. Did you find and correct the condition? Does the horn operate?	-	Go to Step 25	Go to Step 22
15	for poor connections at the harness connector of the BCM. Did you find and correct the condition? Does the horn operate?	-	Go to Step 25	Go to Step 22
16	Repair the high resistance in the horn control circuit or the horn ground circuit. A resistance as low as 0.5 ohms could cause operating problems with the horns. Did you complete the repair?	-	Go to Step 25	-
17	Repair the open or high resistance in the battery positive voltage circuit of the horn relay coil. Did you complete the repair?	-	Go to Step 25	-
18	Important : The horn switch is part of the inflatable restraint steering wheel module. Refer to Section 8B, Supplemental Inflatable Restraints (SIR). Did you complete the repair?	-	Go to Step 25	-
19	Repair the open or high resistance in the battery positive voltage circuit of the horn relay switch. Did you complete the repair?	-	Go to Step 25	-
20	Repair the open or high resistance in the horn control circuit. Did you complete the repair?	-	Go to Step 25	-
21	Repair the open or high resistance in the horn ground circuit. Did you complete the repair?	-	Go to Step 25	-
22	Important : Perform the BCM programming procedure when replacing the BCM. Replace the BCM. Refer to Section 9V, Body Control Module. Did you complete the repair?	-	Go to Step 25	-
23	Replace the horn relay. Did you complete the replacement?	-	Go to Step 25	-
24	Replace the horn. Did you complete the replacement?	-	Go to Step 25	-
25	Operate the horn. Does the horn operate properly?	-	-	Go to Step 1

MAINTENANCE AND REPAIR

ON-VEHICLE SERVICE

Dual Horns

(Left Horn Shown, Right Horn Similar)

Removal Procedure

Disconnect the negative battery cable.
Disconnect the electrical connector.
Remove the bolt and the horn.

Installation Procedure

Notice : Dissimilar metals in direct contact with each other may corrode rapidly. Make sure to use the correct fasteners to prevent premature corrosion.

Install the horn with the bolt.

Tighten

Tighten the horn bolt to 20 N•m (15 lb-ft).

Connect the electrical connector.
Connect the negative battery cable.

GENERAL DESCRIPTION AND SYSTEM OPERATION

Horns

The horns are located under the hood. They are attached near the radiator at the front of the vehicle. The horns are actuated by pressing the steering wheel pad, which grounds the horns electrical circuit.