Honda Ridgeline. Manual — part 494
*01
SJC8A00J32146100000EAAT00
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22-272
Reminder Systems
Circuit Diagram
•
•
•
•
BEEPER
MICU
without power seat
1
1
: Communication line
*2 :
’07 08 RTX models
’07 08 models with power seat
’06 model,
*1 :
3*
2*
BLU/YEL
A6
B4
X35
N44
BLK/YEL
G1
D6
1*
4*
1
2
5
6
P7
WHT/RED
WHT/BLK
WHT/RED
GRN/ORN
GRN/ORN
GRN/ORN
B9
INTERFACE
DRIVE CIRCUIT
G403
BLK
P1
BLK
G501
E9
DRIVE CIRCUIT
DRIVE CIRCUIT
YEL/RED
B11
P13
DRIVE CIRCUIT
BLU/RED
BLU/RED
C10
A10
G402
BLK
BLK
G401
SRS UNIT
F14
H14
LT GRN
X27
N28
BRN/YEL
GAUGE CONTROL MODULE
A19
A20
B6
No.21 (7.5 A)
No.7 (7.5 A)
WHT/RED
UNDER DASH FUSE/RELAY BOX
No.15 (40 A)
No.22 (BAT) (120 A)
YEL
WHT
IG1
BAT
BLK/YEL
YEL
No.23 (IG) (50 A)
UNDER HOOD FUSE/RELAY BOX
BATTERY
IGNITION SWITCH
G401
G501
BLK
RED/WHT
BLK
IG1 HOT in ON (II) and
START (III)
BRAKE
SYSTEM
LIGHT
(LED)
LOW OIL
PRESSURE
INDICATOR
(LED)
SEAT BELT
REMINDER
LIGHT
(LED)
LIGHTS ON
INDICATOR
(LED)
POWER SUPPLY CIRCUIT/CONTROLLER
AREA NETWORK CONTROLLER
B CAN
TRANSCEIVER
COMBINATION SWITCH
CONTROL UNIT
(in the WIPER/WASHER SWITCH)
IMMOBILIZER
CONTROL
UNIT
RECEIVER
PARKING
BRAKE
SWITCH
(Closed :
Pedal pressed)
(Open :
Pedal released)
OIL
PRESSURE
SWITCH
(Closed :
Engine stopped)
DRIVER’S
SEAT BELT
BUCKLE
SWITCH
(Closed : Unbuckled)
(Open : Buckled)
IGNITION
KEY
SWITCH
(Closed :
Key inserted)
IGNITION
KEY LIGHT (LED)
UNDER DASH
FUSE/RELAY BOX
PARKING
BRAKE
REMINDER
SEAT
BELT
REMINDER
KEY IN
REMINDER
LIGHTS ON
REMINDER
2
1
1
2
*01
SJC8A00J26343230053FCAT10
MICU
Cavity
Wire
Test condition
Test: Desired result
Possible cause if desired result is not
obtained
22-273
Control Unit Input Test
UNDER-DASH FUSE/RELAY BOX
CONNECTOR E (16P)
BLK
UNDER-DASH FUSE/RELAY BOX
CONNECTOR H (14P)
BLU/RED
WHT/BLK
UNDER-DASH FUSE/RELAY BOX
CONNECTOR P (30P)
RED/WHT
BLK
NOTE: Before troubleshooting the reminder systems, key light timer, and engine oil pressure indicator system,
troubleshoot the multiplex integrated control system first using B-CAN System Diagnosis Test Mode A (see page
22-99).
1. Turn the ignition switch OFF.
2. Remove the left front door sill trim and left kick panel (see page 20-60).
3. Disconnect under-dash fuse/relay box connectors E, H, and P (see page 22-61).
NOTE: All connectors are wire side of female terminals.
4. Inspect the connector and socket terminals to be sure they are all making good contact.
• If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
• If the terminals look OK, go to step 5.
5. With the connectors still disconnected, make these input tests at the appropriate connectors on the under-dash
fuse/relay box.
• If any test indicates a problem, find and correct the cause, then recheck the system.
• If all the input tests prove OK, go to step 6.
•
•
•
P7
WHT/BLK
Under all
conditions
Attach to ground:
The ignition key light should
come on.
Blown No. 7 (7.5 A) fuse in the
under-dash fuse/relay box
Faulty ignition key light
An open in the wire
(cont’d)
*02
Cavity
Wire
Test condition
Test: Desired result
Gauge Control Module
Possible cause if desired result is not
obtained
22-274
Reminder Systems
Control Unit Input Test (cont’d)
GAUGE CONTROL MODULE CONNECTOR A (20P)
GAUGE CONTROL MODULE CONNECTOR C (20P)
BLK
GAUGE CONTROL MODULE CONNECTOR B (14P)
YEL/RED
BLK
6. Reconnect the connectors to the under-dash fuse/relay box. Turn the ignition switch ON (II) and make these input
tests at the appropriate connectors on the under-dash fuse/relay box.
• If any test indicates a problem, find and correct the cause, then recheck the system.
• If all the input tests prove OK, go to step 7.
•
•
•
•
•
•
•
•
•
•
•
•
•
•
E9
BLK
Under all
conditions
Check for voltage to ground:
There should be less than
0.5 V.
Poor ground (G501)
An open in the wire
P1
BLK
Under all
conditions
Check for voltage to ground:
There should be less than
0.5 V.
Poor ground (G403)
An open in the wire
H14
BLU/RED
Driver’s seat belt
unbuckled
Check for voltage to ground:
There should be less than 1 V.
Faulty driver’s seat belt switch
Poor ground (G501)
An open in the wire
Driver’s seat belt
buckled
Check for voltage to ground:
There should be 5 V or more.
Faulty driver’s seat belt switch
Short to ground
P13
RED/WHT
Ignition key in
the ignition
switch
Check for voltage to ground:
There should be less than 1 V.
Faulty ignition key switch
Poor ground (G401)
An open in the wire
Ignition key out
of the ignition
switch
Check for voltage to ground:
There should be 5 V or more.
Faulty ignition key switch
Short to ground
7. Turn the ignition switch OFF.
8. Remove the gauge control module (see page 22-263).
9. Disconnect gauge control module connectors A (20P), B (14P) and C (20P).
NOTE: All connectors are wire side of female terminals.
Cavity
Wire
Test condition
Test: Desired result
Possible cause if desired result is not
obtained
22-275
10. Inspect the connector and socket terminals to be sure they are all making good contact.
• If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
• If the terminals look OK, go to step 11.
11. Reconnect the connectors at the under-dash fuse/relay box and the gauge control module.
• If any test indicates a problem, find and correct the cause, then recheck the system.
• If the input tests prove OK, go to step 12.
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•
•
•
•
•
•
•
•
B11
YEL/RED
Engine OFF
Check for voltage to ground:
There should be less than 1 V.
Faulty oil pressure switch
An open in the wire
Engine running
Check for voltage to ground:
There should be 5 V or more.
Mechanical problem in the engine
Faulty oil pressure switch
An open in the wire
A10
BLK
Under all
conditions
Check for voltage to ground:
There should be less than
0.5 V.
Poor ground (G401)
An open in the wire
C10
BLK
Under all
conditions
Check for voltage to ground:
There should be less than
0.5 V.
Poor ground (G402)
An open in the wire
12. Do the Gauge Self-diagnostic Procedure (see page 22-244).
• If the beeper sounds and the seat belt reminder light flashes, go to step 13.
• If the beeper does not sound or the seat belt reminder light does not flash, replace the gauge control module.
13. Substitute a known-good gauge control module and recheck the system.
• If the symptom is gone, the gauge control module is faulty; replace it.
• If the symptom is still present, the MICU is faulty; replace the under-dash fuse/relay box.
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