How To Use Circuit Descriptions - GMC Chevrolet Camaro 1998 Service Manual

8-290 Wiring Systems Body and Accessories
Horns Inoperative (cont'd)
Step Action Value(s) Yes
No
5
Replace the horn relay.
-
Go to Horns
-
Is the repair completed? System Check
Connect a test lamp between the underhood junction block
6
terminal A 12 or B 12 (CKT 29) and ground. -
Does the test lamp light? Go to Step B Go to Step 7
Replace the underhood junction block, refer to underhood
7
junction block replacement. -
Go to Homs
-
Is repair completed? System Check
Connect a test lamp between the Ground Splice
8
Pack G104 (CKT 250) and battery (B+). -
Does the test lamp light? Go to Step 9
Go to Step 10
9
Replace horns.
-
Go to Horns
-
Is repair completed?
System Check
Inspect G104 ground, if OK replace Ground Splice
10
Pack G104. -
Go to Horns
-
Is repair completed?
System Check
1. Disconnect the underhood junction block
connector C2.
11
2. Connect a test lamp between the underhood junction
-
block terminal 01 and battery (B+).
3. Press and hold the horn switch.
Does the test lamp light? Go to Step 7 Go to Step 12
1. Disconnect the Dash Integration Module (DIM).
2. Connect a test lamp between the underhood junction
12
block terminal 01 and battery (B+).
-
3. Press and hold the horn switch.
Does the test lamp light? Go to Step 13 Go to Step 14
Replace the Dash Integration Module (DIM), refer to DIM
13
replacement.
Is the repair completed?
1. Disconnect C202.
2. Connect a test lamp between connector C202
14
terminal 812 of the steering column side and
battery (B+).
3. Press and hold the horri switch.
Does the test lamp light?
15
Repair short to ground in CKT 28 (BLK).
Is repair completed?
16
Repair open in CKT 28 in the steering column.
Is the repair completed?
How to Use Circuit Descriptions
The circuit description describes how the system
works electrically. It details how power, ground, inputs,
and outputs are supplied to the system's related
components. The circuit description also explains the
communication and interaction of all components
that affect the operation of the system.
-
Go to Horns
-
System Check
-
Go to Step 15 Go to Step 16
Go to Horns
-
-
System Check
Go.to Horns
-
-
System Check
Battery positive voltage is applied at all times to the
horn relay terminals 85 and 30. Pressing the horn
switch grounds the horn relay coil on CKT 28 (BLK).
The relay coil can also be grounded on CKT 28 (BLK)
by the Dash Integration Module (DIM). The horn
relay applies battery positive voltage to the horns on
CKT 29 (DK GRN) when energized. The horns
sound until the horn switch is released or the DIM
signal is gone.
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