Hazard Lamps Malfunction
Diagnostic Instructions
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Hazard Lamps Request Signal
|
2
|
1
|
1
|
B3596 00
|
Hazard Warning Switch Indicator Signal
|
3
|
3
|
4
|
-
|
Interior Backlighting Control
|
6
|
6
|
5
|
-
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Hazard Switch Ground
|
-
|
1
|
-
|
-
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1. Hazard lamps inoperative
2. Hazard lamps always ON
3. Hazard warning switch indicator inoperative
4. Hazard warning switch always ON
5. Hazard backlighting at full intensity and cannot be dimmed
6. Hazard backlighting does not illuminate
|
|
|
Circuit/System Description
The hazard flashers may be activated in any power mode. The
hazard switch is permanently grounded. When the hazard switch is
placed in the ON position, ground is applied through the hazard
switch signal circuit to the body control module (BCM). The BCM
supplies battery voltage to all turn signal lamps in an ON and OFF
duty cycle. When the hazard switch is activated, the BCM sends a
serial data message to the instrument cluster requesting both turn
signal indicators to be cycled ON and OFF.
Reference Information
Schematic Reference
Connector End View Reference
Component Connector End Views
Description and Operation
Exterior Lighting Systems Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
• |
Ignition ON, perform the scan
tool Hazard Lamps Switch parameter. The reading should change
between Active/Inactive when changing between pressed and released
hazard lamps switch button. |
⇒ |
If not change between Active and Inactive, refer
to Hazard Lamps Switch Malfunction. |
• |
Ignition ON, perform the
Hazard Lamps Switch Backlight test. The Hazard Switch Indicator
should be ON/OFF when changing between the commanded states.
|
⇒ |
If not change between ON and OFF, refer to Hazard
Switch Indicator Malfunction. |
• |
Ignition ON, perform the
instrument cluster All Indicators test ON and OFF test. Both turn
signal indicators should be ON/OFF. |
⇒ |
If not change between ON and OFF, refer to Hazard
Lamp Indicators Malfunction. |
Circuit/System Testing
Hazard Lamps Switch Malfunction
2. |
Disconnect the harness
connector at the S26 Hazard Warning Switch. |
3. |
Disconnect the negative
terminal of the C1 Battery. |
4. |
Test for less than 5 Ω
between the S26 Hazard Warning Switch harness connector ground
circuit terminal 7 and ground. |
⇒ |
If greater than the specified value, test the
ground circuit for an open/high resistance. |
5. |
Reconnect the negative
terminal of the C1 Battery. |
6. |
Ignition ON, verify the scan
tool Hazard Lamp Switch parameter is INACTIVE. |
⇒ |
If not the specified value, test the signal
circuit terminal 10 for a short to ground. If the circuit tests
normal, replace the K9 Body Control Module. |
7. |
Install a 3 A fused jumper
wire between the signal circuit terminal 10 and ground. Verify the
scan tool Hazard Lamp Switch parameter is ACTIVE. |
⇒ |
If not the specified value, test the signal
circuit for a short to voltage or an open/high resistance. If the
circuit tests normal, replace the K9 Body Control Module. |
8. |
If all circuits test normal,
replace the S26 Hazard Warning Switch. |
Hazard Switch Indicator Malfunction
2. |
Disconnect the harness
connector at the appropriate inoperative accent light
component. |
3. |
Disconnect the negative
terminal of the C1 Battery. |
4. |
Test for less than 5.0 Ω
between the ground circuit terminal 7 and ground. |
⇒ |
If greater than the specified range, test the
ground circuit for an open/high resistance. |
5. |
Reconnect the negative
terminal of the C1 Battery. |
6. |
Connect a test lamp between
the backlight control circuit terminal 5 and ground. |
7. |
Ignition ON, command the
Hazard Lamps Switch Backlight test ON and OFF with a scan tool. The
test lamp should turn ON and OFF when changing between the
commanded states. |
⇒ |
If the test lamp is always OFF, test the control
circuit for a short to ground or an open/high resistance. If the
circuit tests normal, replace the K9 Body Control Module. |
⇒ |
If the test lamp is always ON, test the control
circuit for a short to voltage. If the circuit tests normal,
replace the K9 Body Control Module. |
8. |
If all circuits test normal,
test or replace the appropriate component with the S26 Hazard
Warning Switch. |
Hazard Lamp Indicators Malfunction
2. |
Command the All Indicators
test ON and OFF with the scan tool, verify both turn signal
indicators changes between turn ON and OFF. |
⇒ |
If both turn signal indicators changes between
illuminate and not illuminate during the test, replace the K9 Body
Control Module. |
⇒ |
If one or both turn signal indicators do not
illuminate during the test or remain illuminated at all times,
replace the P16 Instrument Cluster. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
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