SRS components are located in this area. Review the SRS component locations (see COMPONENT LOCATION INDEX ), and the precautions and procedures (see PRECAUTIONS AND PROCEDURES ) before performing repairs or service.

Scheme 368

Scheme 368: 2005-2006 Models

Scheme 369

Scheme 370

Scheme 371

Remove the gauge assembly from the dashboard, then disconnect gauge assembly connectors A (30P) and C (16P).
Inspect the connectors and connector terminals to be sure they are making good contact.
If the terminals are bent, loose, or corroded, repair or replace them as necessary, and recheck the system.
Turn the ignition switch ON (II).
Check for voltage between gauge assembly connector terminals and body ground in each shift lever position: Between A7 (BLK/BLU) and ground in the P position. Between A8 (WHT) and ground in the R position. Between A9 (RED/BLK) and ground in the N position. Between A27 (YEL) and ground in the D4 position. Between A11 (PNK) and ground in the D3 position. Between A10 (BLU) and ground in the 2 position. Between A12 (BRN) and ground in the 1 position. There should be 0 V at each terminal to ground in each position, and there should be about 5 V in any other position.
Move the shift lever into the D5 position, and check for voltage between gauge assembly connector terminal A28 (BLK/RED) and body ground. There should be battery voltage in the D5 position, and there should be 0 V in any position other than the D5.
If the test result are different, check for an open in the wire(s), a faulty transmission range switch, or a faulty PCM.
Check for voltage between gauge assembly connector terminal C10 (YEL) and body ground with the ignition switch turned ON (II). There should be battery voltage. If there is no voltage, check for a blown No. 9 (10 A) fuse in the driver's under dash fuse/relay box or an open in the wire.
Turn the ignition switch OFF, and check for continuity between connector terminal C12 (BLK) and body ground. There should be continuity to ground under all conditions. If there is no continuity, check for an open in the wire, or poor ground (G501).
Connect gauge assembly connectors A (30P) and C (16P).
Turn the ignition switch ON (II), and check for voltage in about 2 seconds between connector terminals A24 (RED/GRN) and body ground, and between A28 (BLK/RED) and ground. There should be battery voltage within about 2 seconds after the ignition switch is turned ON (II).
If all input tests prove OK, but the indicator is faulty, replace the gauge assembly.

Scheme 372

Scheme 372: Transmission Range Switch Test

Scheme 373

Disconnect transmission range switch connector.
Check for continuity between terminals at the switch connector. There should be continuity between the terminals in the table for each switch position. Transmission Range Switch Harness Connector
If there is no continuity between any terminals, check that the transmission range switch installation. If the installation is OK, replace the switch (see «TRANSMISSION RANGE SWITCH REPLACEMENT»(/acura/mdx/i-2000-2006/remont/automatic-trans/#automatic-transmission) ).

Scheme 374

Scheme 374: Transmission Range Switch Replacement

Scheme 375

Scheme 376

Scheme 377

Scheme 378

Scheme 379

Scheme 380

Scheme 381

Scheme 382

Remove the intake air duct.
Get the audio and navigation anti-theft codes, and write down the audio presets and disconnect the battery negative terminal, then disconnect the battery positive terminal.
Remove the battery hold-down bracket, then remove the battery and battery tray.
Remove the four bolt securing the battery base in the engine compartment, then remove the battery base.
Remove the nuts securing the shift cable bracket (A).
Remove the spring clip/washer (B) from the control lever (C), and disconnect the shift cable end (D) from the control lever.
Pry the lock tab of the lock washer (A) on the control lever (B), and remove the nut (C), lock washer, spring washer (D) and control lever.
Pry the lock tabs of the lock washer (E) on the transmission range switch (F), hold the selector control shaft (G) with a 6.0 mm wrench, and loosen the lock nut (H).
Remove the lock nut and lock washer, then remove the transmission range switch (two bolts).
Set the new transmission range switch (A) to the N position. The transmission range switch clicks in the N position, and the control shaft hole (B) aligns with the N positioning line (C).
Set the selector control shaft to the N position by turning the control shaft with a 6.0 mm wrench.
Install the transmission range switch (A) gently over the selector control shaft (B), and install the bolts loosely.
Install the new lock washer (A) over the selector control shaft (B) with aligning the projection (C) of the lock washer with the N positioning line (D) on the transmission range switch (E), and install the lock nut (F).
Push the lock nut against the transmission housing to seat the transmission range switch into the selector control shaft, and tighten the lock nut to 12 N.m (1.2 kgf.m, 8.7 lbf.ft) while holding the selector control shaft with a 6 mm wrench, then bend the lock tabs against the lock nut.
Tighten the bolts to 12 N.m (1.2 kgf.m, 8.7 lbf.ft) securing the transmission range switch.
Install the control lever (A), spring washer (B), lock washer (C), and lock nut (D) on the selector control shaft (E).
If the lever cover (F) was removed or replaced, install the lever cover on the control lever.
Connect the shift cable end to the control lever, and secure the cable end with the spring clip/washer.
Secure the shift cable bracket with the nuts.
Install the battery base, then install the intake air duct.
Install the battery tray and battery, then secure the battery with its hold-down bracket. Connect the battery terminals.
Clean the battery posts and cable terminals with sandpaper, then assemble them and apply grease to prevent corrosion.
Turn the ignition switch ON (II). Move the shift lever through all positions, and check the transmission range switch synchronization with the A/T gear position indicator.
Check that the engine can start in the P and N positions, and cannot start in any other shift lever position.
Check that the back up lights come on when the shift lever is in the R position.
Allow the all wheels to rotate freely, then start the engine, and check the shift lever operation.
Do the power window control unit reset procedure (see «RESETTING THE POWER WINDOW CONTROL UNIT»(/acura/mdx/i-2000-2006/remont/windows/#power-windows) ).
Enter the audio and navigation anti-theft codes, then enter the presets, and set the clock.

Scheme 383

Scheme 383: 2003-2004 Models

Remove the gauge assembly (see «GAUGE ASSEMBLY REPLACEMENT»(/acura/mdx/i-2000-2006/remont/gauges-instrument-panels/#gauges) ).
Disassemble the gauge assembly.
Replace the bulbs (A) in the gauge assembly (B).

Scheme 384

Scheme 384: 1st-hold Switch Test/Replacement

Remove the console panel and center console (see «CENTER CONSOLE REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/gauges-instrument-panels/#consoles__center-console-removalinstallation) ).
Disconnect the switch assembly connector (6P).
Shift the shift lever into the 1 position, then check for continuity between the No. 1 and No. 3 terminals. There should be continuity.
Shift the shift lever out of the 1 position, and check for continuity between the terminals in step 3 . There should be no continuity.
If the 1st-hold switch is faulty, remove the shift lever assembly (see «SHIFT LEVER REMOVAL»(/acura/mdx/i-2000-2006/remont/automatic-trans/#automatic-transmission) ), and replace the detent bracket (see «SHIFT LEVER DISASSEMBLY/REASSEMBLY»(/acura/mdx/i-2000-2006/remont/automatic-trans/#automatic-transmission__shift-lever-disassemblyreassembly) ). (The 1st-hold switch is not available separately).

Scheme 385

Scheme 385: Component Location Index

Scheme 386

Scheme 386: Circuit Diagram

Scheme 387

Scheme 388

Scheme 388: Shift Lock System Circuit Troubleshooting

Scheme 389

Scheme 390

Scheme 391

Scheme 392

Scheme 393

Scheme 394

Scheme 395

Scheme 396

Scheme 397

Scheme 398

Connect the HAS to the DLC.
Choose Shift Lock Solenoid Test in Miscellaneous Test Menu, and check that the shift lock solenoid operates with the HAS. Does the shift lock solenoid work properly? YES - Go to step 14 . NO - Go to step 3.
Remove the console panel and center console (see «CENTER CONSOLE REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/gauges-instrument-panels/#consoles__center-console-removalinstallation) ).
Disconnect the shift lock solenoid connector.
Turn the ignition switch ON (II).
Measure the voltage between shift lock solenoid connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 7. NO - Check for a blown No. 8 (7.5 A) fuse in the driver's under dash fuse/relay box. If the fuse is OK, repair open or short in the wire between the shift lock solenoid connector and the driver's under-fuse /relay box.
Shift the shift lever into the P position, and press the brake pedal. Do not press the accelerator.
Measure the voltage between shift lock solenoid connector terminals No. 1 and No. 2 while pressing the brake pedal. Is there battery voltage? YES - Go to step 9. NO - Go to step 10 .
Release the brake pedal, and measure the voltage between connector terminals No. 1 and No. 2. The shift lever must be in the P position. Is there battery voltage? YES - Repair a short to ground in the wire between PCM connector terminal E2 and the shift lock solenoid. NO - Check shift lock solenoid mechanism. If the mechanism is OK, replace the shift lock solenoid (see «SHIFT LOCK SOLENOID TEST»(/acura/mdx/i-2000-2006/remont/automatic-trans/#automatic-transmission) ).
Turn the ignition switch OFF.
Jump the SCS line with the HAS.
Disconnect PCM connector B (56P).
Check for continuity between PCM connector terminal B1 and shift lock solenoid connector terminal No. 2. Is there continuity? YES - Substitute a known-good PCM and recheck. NO - Repair an open in the wire between PCM connector terminal B1 and the shift lock solenoid.
Press the brake pedal. Are the brake lights ON? YES - Go to step 15. NO - Repair faulty brake light circuit.
With the brake pedal depressed, check the BRAKE SWITCH INPUT in the ENGINE DATA list with the HAS. Is ON indicated? YES - Go to step 32 . NO - Go to step 16.
Turn the ignition switch OFF.
Jump the SCS line with the HAS.
Disconnect PCM connectors A (73P) and B (56P).
Measure the voltage between PCM connector terminals B39 and A39 or A40 while pressing the brake pedal and when the brake pedal is released. Is there battery voltage while the brake pedal is pressing, and no voltage when the pedal is released? YES - Go to step 22 . NO - Go to step 20.
Check for continuity between PCM connector terminal B39 and brake pedal position switch 4P connector terminal No. 2. Is there continuity? YES - Go to step 21. NO - Repair an open in the wire between PCM connector terminal B39 and the brake pedal position switch.
Check for continuity between PCM connector terminals A39 and body ground, between A40 and body ground, and between A73 and body ground. Is there continuity? YES - Substitute a known-good PCM and recheck. NO - Repair an open in the wires between PCM connector terminals A39, A40, A73, and ground (G101, G102), or repair poor ground (G101, G102).
Connect PCM connectors A (73P) and B (56P).
Disconnect the transmission range switch connector.
Turn the ignition switch ON (II).
Measure the voltage between transmission range switch connector terminals No. 4 and No. 5. Is there voltage (2003-2004 models) or about 5 V (2005-2006 models)? YES - Go to step 32 . NO - Go to step 26.
Turn the ignition switch OFF.
Disconnect PCM connector B (56P).
Disconnect gauge assembly connector A (30P) (see «GAUGE ASSEMBLY REPLACEMENT»(/acura/mdx/i-2000-2006/remont/gauges-instrument-panels/#gauges) ).
Check for continuity between PCM connector terminal B22 and body ground. Is there continuity? YES - Repair short in the wire between PCM connector terminal B22 and the transmission range switch. NO - Go to step 30.
Check for continuity between PCM connector terminal B22 and transmission range switch connector terminal No. 4. Is there continuity? YES - Go to step 31. NO - Repair open in the wire between PCM connector terminal B22 and the transmission range switch.
Check for continuity between transmission range switch connector terminal No. 5 and body ground. Is there continuity? YES - Substitute a known-good PCM and recheck. NO - Repair open in the wire between transmission range switch connector terminal No. 5 and ground (G101, G102), or repair poor ground (G101, G102).
Test the transmission range switch (see «TRANSMISSION RANGE SWITCH TEST»(/acura/mdx/i-2000-2006/remont/automatic-trans/#automatic-transmission) ). Is the switch OK? YES - Connect the transmission range switch connector, then go to step 33. NO - Replace the transmission range switch (see «TRANSMISSION RANGE SWITCH REPLACEMENT»(/acura/mdx/i-2000-2006/remont/automatic-trans/#automatic-transmission) ).
Connect the HAS to the DLC.
Check the APP SENSOR-1 input in the ENGINE DATA list with the HAS. Do not press the accelerator. Is the APP SENSOR-1 opening 11 % and above, or the sensor voltage 0.90 V and above? YES - Go to step 35. NO - Substitute a known-good PCM and recheck.
Check the throttle cable adjustment (see «IMT (IMRC) ACTUATOR REPLACEMENT»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#intake-air-system) ). Is the throttle cable adjustment within the specification? YES - Check APP Sensor-1 terminal pin fit, and repair if necessary. If the pin fit is OK, replace the APP Sensor-1 (see «APP SENSOR SIGNAL INSPECTION»(/acura/mdx/i-2000-2006/remont/testing-diagnostics/#electronic-throttle-control-system__app-sensor-signal-inspection) ). NO - Adjust the throttle cable or repair the throttle linkage.

Scheme 399

Scheme 399: Reverse Lock System Circuit Troubleshooting

Scheme 400

Scheme 401

Scheme 402

Check whether the HAS indicates P0705 or P0706. Does the HAS indicate either code? YES - Perform the troubleshooting flowchart for the indicated code(s). NO - Go to step 2.
Turn the ignition switch OFF.
Shift the shift lever into the P position while pushing the shift lock release.
Turn the ignition switch ON (II).
Press the brake pedal, and do not press the accelerator pedal.
Shift the shift lever out of the P position to check that the shift lock solenoid operates. Does the shift lever shift out of the P position? YES - Go to step 7. NO - Perform the troubleshooting flowchart for the Shift Lock System Circuit (see «SHIFT LOCK SYSTEM CIRCUIT TROUBLESHOOTING»(/acura/mdx/i-2000-2006/remont/automatic-trans/#automatic-transmission) ).
Turn the ignition switch OFF.
Remove the shift lock relay.
Check for continuity between the No. 1 and No. 4 terminals of the shift lock relay while connecting the battery positive terminal to the No. 5 terminal of the shift lock relay, and connecting the negative terminal to the No. 3 terminal. Is there no continuity when connecting the battery terminals, and continuity when disconnecting the battery terminals? YES - Go to step 10. NO - Replace the shift lock relay.
Shift the shift lever into the N position.
Check for continuity between the No. 4 terminal of the shift lock relay harness connector and body ground. Is there continuity? YES - Go to step 12. NO - Repair open in the wire between the No. 4 terminal of the shift lock relay and the transmission range switch.
Shift the shift lever out of the N position.
Check for continuity between the No. 4 terminal of the shift lock relay harness connector and body ground. Is there continuity? YES - Repair short to ground in the wire between the No. 4 terminal of the shift lock relay and the transmission range switch. NO - Go to step 14.
Check for continuity between the No. 1 terminal of the shift lock relay harness connector and the No. 2 terminal of the shift lock solenoid connector. Is there continuity? YES - Check for loose terminal fit in the connectors. Repair the reverse lock mechanism. NO - Repair open in the wire between the No. 1 terminal of the shift lock relay and the shift lock solenoid connector.

Scheme 403

Scheme 403: Key Interlock System Circuit Troubleshooting

Scheme 404

Scheme 405

Scheme 406

Scheme 407

Disconnect the key switch connector (7P) from the steering lock assembly.
Connect the No. 7 terminal of the key switch connector to the battery positive terminal, and connect the No. 5 terminal to the battery negative terminal.
Turn the ignition switch to ACC (I), then push the ignition key.
Check the key interlock solenoid operation. A clicking sound should be heard while pushing the ignition key, and you should not be able to turn it to the OFF position. Does the key interlock solenoid operate properly? YES - Go to step 5. NO - Faulty key interlock solenoid/switch. Replace the ignition key cylinder/steering lock assembly.
Measure the voltage between the No. 7 terminal and body ground. Is there battery voltage? YES - Go to step 6. NO - Check for a blown No. 47 (20 A) fuse in the underhood fuse/relay box. If the fuse is OK, repair open or short in the wire between the No. 7 terminal of the key switch connector and underhood fuse/relay box.
Disconnect the switch assembly connector (6P) on the shift lever.
With the shift lever in Park and pushed to the right, check for continuity between the No. 4 and No. 2 terminals of the switch assembly connector (6P). Is there continuity? YES - Go to step 8. NO - Repair open in the wires between the park pin switch and the switch assembly connector (6P). If the wires are OK, remove the shift lever assembly (see «SHIFT LEVER REMOVAL»(/acura/mdx/i-2000-2006/remont/automatic-trans/#automatic-transmission) ), and replace the shift lever detent bracket assembly (see «SHIFT LEVER DISASSEMBLY/REASSEMBLY»(/acura/mdx/i-2000-2006/remont/automatic-trans/#automatic-transmission__shift-lever-disassemblyreassembly) ).
Check for continuity between the No. 4 terminal of the switch assembly connector (6P) and the No. 5 terminal of the key switch connector. Is there continuity? YES - Go to step 9. NO - Repair open in the wire between No. 4 terminal of the switch assembly connector (6P) and the No. 5 terminal of the key switch connector.
Check for continuity between the No. 2 terminal of the switch assembly connector (6P) and body ground. Is there continuity? YES - Check for loose terminal pin fit in the key switch connector and switch assembly connector (6P). If necessary, substitute a known-good steering lock assembly. NO - Repair open in the wire between the No. 2 terminal of the switch assembly connector (6P) and ground (G401), or repair poor ground (G401).

2005-2006 Models Acura MDX I

2005-2006 Models