Honda Civic. Manual — part 398

Set speed will not
resume when the
resume/accel
switch is pressed
(with the cruise
control main
switch turned on,
and set speed
temporarily
canceled by
pressing the brake
pedal)

TROUBLESHOOTING
INFORMATION ).

2. Check the brake pedal position

switch adjustment (see BRAKE
PEDAL AND BRAKE PEDAL
POSITION SWITCH
ADJUSTMENT ).

3. Do the cruise control input test

(see CRUISE CONTROL
INPUT TEST ). Test the cruise
control resume/accel switch
signal input. Test the brake pedal
position switch signal input.

4. Do the cruise control combination

switch test (see CRUISE
CONTROL COMBINATION
SWITCH
TEST/REPLACEMENT ).

Faulty brake
pedal position
switch

Open circuit,
loose or
disconnected
terminals: LT
GRN/BLK,
ORN

Set speed will not
resume when the
resume/accel
switch is pressed
(with the cruise
control main
switch turned on,
and set speed
temporarily
canceled by
pressing the clutch
pedal) (M/T)

1. Check for PGM-FI DTCs (see

GENERAL
TROUBLESHOOTING
INFORMATION ).

2. Check the clutch pedal position

switch adjustment (see CLUTCH
PEDAL, CLUTCH PEDAL
POSITION SWITCH, AND
CLUTCH INTERLOCK
SWITCH ADJUSTMENT ).

3. Do the cruise control input test

(see CRUISE CONTROL
INPUT TEST ). Test the cruise
control resume/accel switch
signal input. Test the clutch pedal
position switch signal input.

Faulty clutch
pedal position
switch

Open circuit,
loose or
disconnected
terminals: LT
GRN/BLK,
ORN

2008 Honda Civic LX

2006-08 ACCESSORIES & EQUIPMENT Cruise Control (R18A1) - Civic (All Except Hybrid)

CIRCUIT DIAGRAM

4. Do the cruise control combination

switch test (see CRUISE
CONTROL COMBINATION
SWITCH
TEST/REPLACEMENT ).

With the ignition
switch ON (II),
and the lighting
switch turned on,
the cruise control
combination
switch
illumination does
not come on

Replace the cruise control
combination switch (see CRUISE
CONTROL COMBINATION
SWITCH
TEST/REPLACEMENT ).

2008 Honda Civic LX

2006-08 ACCESSORIES & EQUIPMENT Cruise Control (R18A1) - Civic (All Except Hybrid)

Fig. 2: Cruise Control - Circuit Diagram
Courtesy of AMERICAN HONDA MOTOR CO., INC.

CRUISE CONTROL INPUT TEST

NOTE:

Always make sure you have the latest HDS software before
doing the input tests.

2008 Honda Civic LX

2006-08 ACCESSORIES & EQUIPMENT Cruise Control (R18A1) - Civic (All Except Hybrid)

1. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC)

(see step 2 in HOW TO USE THE HDS (HONDA DIAGNOSTIC
SYSTEM) ).

2. Turn the ignition switch ON (II).
3. Make sure the HDS communicates with the vehicle and the ECM/PCM. If it

doesn't, troubleshoot the DLC circuit (see DLC CIRCUIT
TROUBLESHOOTING ).

4. Go to PGM-FI, and check for DTCs (see DTC TROUBLESHOOTING ).
5. Do the following tests while monitoring parameters in the PGM-FI DATA

LIST with the HDS.

Cruise Control Input Test

NOTE:

Intermittent failures are often caused by loose circuit
connections. While monitoring cruise control inputs, flex
their circuits, and note if any of the test results change.

Signal to be

tested

Test condition

Parameter: Desired

result

Possible cause if result

is not obtained

Brake pedal
position
switch signal

Brake pedal
pressed, then
released

CRUISE BRAKE
SW should indicate
OFF when the brake
pedal is pressed and
ON when the brake
pedal is released.

Faulty brake pedal
position switch

Blown No. 3 (10 A)
fuse in the under-
dash fuse/relay box

Open in the wire
between the engine
control module
(ECM/powertrain
control module
(PCM) and the
brake pedal position
switch

A wire shorted to
ground between the

2008 Honda Civic LX

2006-08 ACCESSORIES & EQUIPMENT Cruise Control (R18A1) - Civic (All Except Hybrid)