Honda Civic. Manual — part 998

If a test indicates a problem, find and correct the cause, then recheck the
system.

If the input test proves OK, go to step 6.

DIAGNOSTIC CHART

6. Reconnect the connector to the under-dash fuse/relay box, and make these

input tests at the connector.

If any test indicates a problem, find and correct the cause, then recheck the
system.

If all the input tests prove OK, the MICU must be faulty; replace the
under-dash fuse/relay box.

DIAGNOSTIC CHART

Cavity Wire

Test

condition

Test: Desired result

Possible cause if

result is not

obtained

E15 BRN

Under all
conditions

Connect battery power to
the E15 terminal: The
back-up lights should come
on.

Poor ground
(G701)

Blown bulb

An open in
the wire

Cavity Wire

Test condition

Test: Desired

result

Possible cause if

result is not

obtained

E37 GRN

Driver's door open

Check for voltage
to ground: There
should be less than
0.5 V.

Faulty driver's
door switch

An open in the
wire

Driver's door closed

Check for voltage
to ground: There
should be 5 V or
more.

Faulty driver's
door switch

Short to
ground in the

2008 Honda Civic EX

2006-08 ACCESSORIES AND EQUIPMENT Reminder Systems - Civic GX

wire

F9

PUR

Transmission range
switch in R

Check for voltage
to ground: There
should be less than
0.5 V.

Poor ground
(G101)

Faulty
transmission
range switch

An open in the
wire

Transmission range

switch in any other

position than R

Check for voltage
to ground: There
should be 5 V or
more.

Faulty
transmission
range switch

Short to
ground in the
wire

R6

PNK

Ignition key inserted
into the ignition
switch

Check for voltage
to ground: There
should be less than
0.5 V.

Poor ground
(G504)

Faulty ignition
key switch

An open in the
wire

Ignition switch OFF

and ignition key

removed from the

ignition switch

Check for voltage
to ground: There
should be 5 V or
more.

Faulty ignition
key switch

Short to
ground in the
wire

S1 . S5 ORN

Combination light
switch OFF

Check for voltage
between S1 and S5
terminals: There
should be less than
0.5 V.

Faulty
combination
light switch

An open in the
wire

Check for voltage

Faulty
combination

2008 Honda Civic EX

2006-08 ACCESSORIES AND EQUIPMENT Reminder Systems - Civic GX

Combination light

switch in any other

position than OFF

between S1 and S5
terminals: There
should be 5 V or
more.

light switch

Short to
ground in the
wire

S11 .

S5

PNK

Combination light
switch (Headlight
position) ON

Check for voltage
between S11 and
S5 terminals:
There should be
less than 0.5 V.

Faulty
combination
light switch

An open in the
wire

Combination light

switch OFF

Check for voltage
between S11 and
S5 terminals:
There should be 5
V or more.

Faulty
combination
light switch

Short to
ground in the
wire

S13 .

S5

GRY

Combination light
switch (SMALL
position) ON

Check for voltage
between S13 and
S5 terminals:
There should be
less than 0.5 V.

Faulty
combination
light switch

An open in the
wire

Combination light

switch OFF

Check for voltage
between S13 and
S5 terminals:
There should be 5
V or more.

Faulty
combination
light switch

Short to
ground in the
wire

T11 BLU

Fuel fill door open

Check for voltage
to ground: There
should be less than
0.5 V.

Faulty fuel fill
door switch

An open in the
wire

Check for voltage
to ground: There

Faulty fuel fill
door switch

2008 Honda Civic EX

2006-08 ACCESSORIES AND EQUIPMENT Reminder Systems - Civic GX

FUEL FILL DOOR SWITCH TEST

1. Remove the trunk left side trim panel, refer to the TRIM

REMOVAL/INSTALLATION - TRUNK AREA .

2. Disconnect the 2P connector (A) from the fuel fill door switch (B).

Fig. 5: Identifying 2P Connector And Fuel Fill Door Switch

3. Check for continuity between the terminals.

There should be continuity between the No. 1 and No. 2 terminals with the
fuel fill door in the open.

4. If the continuity is not as specified, replace the fuel fill door switch.

FUEL FILL DOOR SWITCH REPLACEMENT

1. Remove the these items:

Fuel fill door closed

should be 5 V or
more.

Short to
ground in the
wire

NOTE:

Put on gloves to protect your hands.

Take care not to scratch the body and related parts.

2008 Honda Civic EX

2006-08 ACCESSORIES AND EQUIPMENT Reminder Systems - Civic GX