Stop Lamps Malfunction
Diagnostic Instructions
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
5V Reference
|
C0277 06
|
C0277 06
|
C0277 07
|
-
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Signal
|
C0277 06
|
C0277 06
|
C0277 07
|
C0277 09
|
Low Reference
|
-
|
1
|
1
|
-
|
1. Stop Lamps Malfunction
|
|
| |
Circuit/System Description
The brake pedal position (BPP) sensor is used to sense the
action of the driver application of the brake pedal. The brake
pedal position (BPP) sensor provides an analog voltage signal that
will increase as the brake pedal is applied. The body control
module (BCM) provides a low reference signal and a 5 V reference
voltage to the brake pedal position sensor. When the variable
signal reaches a voltage threshold indicating the brakes have been
applied, the BCM will apply battery voltage to the stop lamp
control circuit and center high mounted stop lamp control circuit .
When the control circuit is energized the stop lamps are
illuminated.
Reference Information
Schematic Reference
Exterior Lights Schematics
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
| 1. |
Ignition ON, observe the scan
tool Brake Lamps Command parameter. The reading should be between
Inactive/Active and change when the brake pedal is
applied/unapplied. |
| ⇒ |
If the parameter does not cycle between the
specified values, refer to Brake Pedal Position Sensor
Malfunction. |
| 2. |
The left and right brake lamps
should be ON when the brake pedal is applied and OFF when the brake
pedal is unapplied. |
| ⇒ |
If the brake lamps are not ON/OFF, refer to Brake
Lamps Malfunction. |
| ⇒ |
If the brake lamps turn ON and OFF replace the B22
Brake Pedal Position Sensor. |
Circuit/System Testing
Brake Pedal Position Sensor Malfunction
| 1. |
Ignition OFF, disconnect the
harness connector at the B22 Brake Pedal Position Sensor.
|
| 2. |
Ignition OFF, test for less
than 5 Ω between the low reference circuit terminal A and
ground. |
| ⇒ |
If greater than the specified range, test the low
reference circuit for an open/high resistance. If the circuit tests
normal, replace the K9 Body Control Module. |
| 3. |
Ignition ON, command the
appropriate Brake Lamp test with a scan tool. The brake lamps
should turn ON and OFF when changing between the commanded
states. |
| ⇒ |
If the brake lamps do not turn ON and OFF replace
the K9 Body Control Module. |
Brake Lamps Malfunction
| 1. |
Ignition OFF, disconnect the
appropriate harness connector at the appropriate tail lamp listed
below: |
| |
• |
E42L Tail Lamp Assembly -
Left |
| |
• |
E42R Tail Lamp Assembly -
Right |
| 2. |
Test for less than 5 Ω
between the appropriate ground circuit harness connector terminal
listed below and ground: |
| |
• |
E42L Tail Lamp Assembly - Left
terminal B |
| |
• |
E42R Tail Lamp Assembly -
Right terminal C |
| ⇒ |
If greater than the specified value, test the
ground circuit for an open/high resistance. |
| 3. |
Connect a test lamp between
the appropriate control circuit harness connector terminal listed
below and ground: |
| |
• |
E42L Tail Lamp Assembly - Left
terminal D |
| |
• |
E42R Tail Lamp Assembly -
Right terminal A |
| 4. |
Command the Center Brake Lamp
test with a scan tool. The test lamp should turn ON and OFF when
changing between the commanded states. |
| ⇒ |
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. |
| ⇒ |
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. |
| 5. |
If all circuits test normal,
replace the appropriate tail lamp. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
